In this study, we used data on the length and weight of fish to determine the length-weight relat... more In this study, we used data on the length and weight of fish to determine the length-weight relationship and condition factors of eight commercial fish targeted by traditional Papuan fishers in Youtefa Bay, Papua Province, Indonesia. The fish species were Lutjanus fulvus, Gerres oyena, Parupeneus barberinus, Siganus spinus, Siganus canaliculatus, Pelates quadrilineatus. Mugil cephalus, and Hemiramphus far. A total of 245 fish specimens were collected from Papuan fishermen from January to March 2020. The total body length and weight ranged from 15.2 to 32.1 cm (average 20.26±3.73 cm) and 42.72 to 371.86 gr (average 124.10±52.45 gr), respectively. The b value ranged from 2.692 to 3.079, with the coefficient of determination (R2) ranging from 0.902 to 0.995. The growth patterns of the eight fish species were allometric (b≠3; t-test3). The relative condition factor and Fulton condition factor values ranged from 0.874 to 1.201 (average 0.999±0.321) and 0.204 to 2.726 (average 1.612±0.515...
Journal of tropical biodiversity and biotechnology, Sep 14, 2022
As one of the marine areas included in the world's Coral Triangle region, Yos Sudarso Bay have a ... more As one of the marine areas included in the world's Coral Triangle region, Yos Sudarso Bay have a potential reef fish diversity that needs to be studied. However, there is very little information about reef fish diversity in these waters to date. This study aims to determine the species diversity of reef fish in Yos Sudarso Bay, Jayapura City, Indonesia. The study was conducted in April 2020 at seven sites; six of them located inside the Yos Sudarso Bay and one more located outside the bay. Sampling was carried out using the Underwater Visual Census method (25 m long and 5 m wide). Relative abundance by species, and diversity (H´), evenness (E), and dominance (C) indices were calculated. A total of 1,075 individual reef fish was recorded in seven study sites, representing 122 species and 26 families. Locations showed differences in reef fish abundance (86 to 215 individuals/125 m 2), diversity (H´= 2.462 to 3.358), evenness (E = 0.770 to 0.887), and dominance (C = 0.047 to 0.155). This study has provided preliminary information on species diversity, fish abundance, and the ecological index of reef fish in Yos Sudarso Bay, Jayapura City.
Monitoring shoreline changes is important in detecting abrasion and accretion in coastal areas. T... more Monitoring shoreline changes is important in detecting abrasion and accretion in coastal areas. This study aimed to determine the level of shoreline change caused by abrasion and accretion and estimate the change rate. The study area covers coastal areas in ten Districts in Biak Numfor Regency (only on Biak Island). Six Landsat image datasets (1997, 2002, 2007, 2013, 2018, and 2022) were used to determine the coastline. Shoreline changes were analysed using DSAS software. The results of digitising the shoreline show a change in the length of the shoreline during the six data periods. Based on NSM and EPR for the last ten years (2013-2022), the average shoreline changes due to abrasion range from -6.65 to -13.16 m with an abrasion rate of -0.76 to -1.50 m/year. Meanwhile, the average shoreline changes due to accretion ranged from 4.64 to 8.45 m with an accretion rate of 0.53 m/year to 0.96 m/year. Changes in shoreline based on the rate of abrasion and accretion vary greatly in each d...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Terumbu karang memiliki fungsi, peranan dan manfaat, baik secara langsung maupun tidak langsung b... more Terumbu karang memiliki fungsi, peranan dan manfaat, baik secara langsung maupun tidak langsung bagi masyarakat yang tinggal di wilayah pesisir. Secara ekologi terumbu karang bermanfaat sebagai sumber makanan, habitat, tempat berkembang biak dan tempat hidup bagi berbagai oarganisme. Penelitian ini bertujuan untuk mengetahui jenis-jenis lifeform tutupan karang, persentase terumbu karang dan parameter fisik-kimia perairan Teluk Tanah Merah Distrik Depapre. Pengambilan data selama 7 bulan dari bulan Oktober 2017 sampai April 2018. Metode pengamatan terumbu karang yang digunakan adalah observasi dan Point Intercept Transect (PIT) pada kedalaman 3 m dan 10 m. Hasil penelitian menunjukkan bahwa terdapat 5 tipe lifeform karang Acropora di perairan Teluk Tanah Merah yaitu Acropora encrusting (ACE), Acropora submassive (ACS), Acropora digitate (ACD), Acropora branching (ACB,) dan Acropora tabulate (ACT), serta 9 jenis non-Acropora yaitu Coral branching (CB), Coral massive (CM), Coral subma...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Ekosistem terumbu karang memiliki nilai dan arti yang penting baik dari segi ekologi, sosial, eko... more Ekosistem terumbu karang memiliki nilai dan arti yang penting baik dari segi ekologi, sosial, ekonomi maupun budaya masyarakat. Keberadaan ekosistem terumbu karang dapat berdampak pada ekonomi dan pengembangan wilayah pesisir. Penelitian ini bertujuan untuk mengetahui kondisi tutupan karang hidup dan nilai manfaat ekonomi dari ekosistem terumbu karang di perairan Tablasupa. Pengamatan kondisi tutupan karang hidup dilakukan dangan menggunakan metode Point Intersept Trasect (PIT) pada kedalaman 3 m di 2 stasiun penelitian. Sedangkan nilai manfaat ekonomi ekosistem terumbu karang diperoleh dengan menggunakan konsep valuasi ekonomi untuk menghitung nilai manfaat secara langsung maupun manfaat tidak langsung dari potensi ekosistem terumbu karang yang ada. Hasil penelitian ini menunjukkan bahwa secara umum kondisi tutupan karang hidup di perairan Tablasupa berada dalam kategori sedang hingga baik dengan tutupan karang hidup berkisar antara 34,0% - 52,5%. Jenis karang hidup yang dominan ad...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Ekosistem mangrove Teluk Youtefa memiliki peranan yang sangat vital terhadap kelangsungan hidup p... more Ekosistem mangrove Teluk Youtefa memiliki peranan yang sangat vital terhadap kelangsungan hidup penduduk Kota Jayapura, teristimewa masyarakat pesisir yang bermukim di sepanjang garis pantai teluk ini. Kegiatan ini dilakukan sebagai salah satu bentuk kepedulian kampus untuk mendukung pemerintah dalam upaya pelesteraian ekosistem mangrove Holte Camp. Kegiatan ini dilakukan dengan metode: 1). Observasi lokasi; 2). Diskusi Kelompok Terpadu (DKP); 3). Penyuluhan Perikanan Peduli Ekositem Mangrove Berkelanjutan; 4). Evaluasi Kegiatan. Kegiatan ini diselenggarakan pada hari Sabtu tanggal 9 September 2017 di Kantor Desa Holte Camp dengan jumlah peserta sebanyak 22 orang. Hasil kegiatan diskusi perencanaan pengelolaan ekosistem mangrove, dari 59,1% masyarakat yang paham pengelolaan ekosistem mangrove kemudian meningkat menjadi 86,4% setelah mengikuti kegiatan. Dari 77,2% peserta berkomitmen akan merencanakan pengelolaan ekosistem mangrove di pantai Holte Camp dan akan membantu orang lain da...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Salah satu karakteristik perairan Mimika adalah banyaknya sungai-sungai besar yang bermuara di wi... more Salah satu karakteristik perairan Mimika adalah banyaknya sungai-sungai besar yang bermuara di wilayah perairan Mimika yang mempengaruhi berbagai aktivitas, salah satunya adalah aktivitas transportasi kapal berukuran besar yang akan masuk dan keluar di pelabuhan Poumako dan Port Site-Freeport harus melalui sungai dan sangat bergantung pada proses pasang surut air laut. Penelitian ini bertujuan untuk mengetahui dan mengkaji karakteristik pasang surut di perairan Mimika, Provinsi Papua. Data yang digunakan adalah data pasang surut selama 29 hari dengan interval pengamatan 1 jam. Penentuan tipe pasang surut dan tinggi muka air rata-rata dengan menggunakan metode Least-Squares. Hasil pengolahan data menunjukkan bahwa tipe pasang surut di perairan Mimika adalah pasang surut campuran condong ke harian tunggal dengan bilangan Formzahl 2,9498. Hal ini berarti bahwa pada perairan Mimika dalam sehari terjadi satu kali atau dua kali pasang dengan interval tinggi air laut yang berbeda. Adapun n...
A study was conducted to estimate the distribution and density of demersal fish in Youtefa Bay, P... more A study was conducted to estimate the distribution and density of demersal fish in Youtefa Bay, Papua, Indonesia, using hydroacoustic technology. The hydroacoustic survey was carried out using a single beam echosounder SIMRAD EK-15 which operates at a frequency of 200 kHz. The hydroacoustic data was processed using Echoview software with a threshold between -70.00 to -34.00 dB. Schooling fish were detected at a maximum distance of 3 m from the seabed, with average volume backscattering strength ranging between -60.13 and -42.01 dB. The demersal fish density in the Youtefa Bay ranged from 0.09 to 42.19 fish m-3 with an average density of 12.62 fish m-3. The schools of demersal fish were dominantly detected in the coastal waters of Enggros Village to Abe Pantai Village. The condition of substrate and water depth seems to influence the spatial and vertical distribution of demersal fish in the Youtefa Bay.
This study aims to assess and quantify the economic value of coastal ecosystem services (CES) in ... more This study aims to assess and quantify the economic value of coastal ecosystem services (CES) in the coastal areas of Jayapura City based on the perceptions of Papuan indigenous peoples. Data collection was conducted from March to April 2018 using the direct interview method based on questionnaires to 228 respondents in Enggros, Tobati, and Nafri villages. The CES value in Jayapura City is estimated to be around USD 5,427,212.34/year, which consists of service values of mangrove, coral reef, and seagrass ecosystems that are USD 4,447,802.85/year or USD 19,079.46/ha/year, USD 424,333.06/year or USD 11,303.49/ha/year, and USD 555,076.43/year or 5,008.36/ha/year, respectively. The value of CES as a provider of fishery products is quite high because of the high desire of the community to exploit and utilize natural resources such as fish, crabs, shrimp, and shellfish in coastal ecosystems to as a food resource. Therefore, with the description of the CES value in this study, good coastal...
Abstract The present study combined the data of environmental parameters and plankton distributio... more Abstract The present study combined the data of environmental parameters and plankton distribution using hydroacoustic technology with the purpose to map the horizontal and vertical distribution of plankton in Yos Sudarso Bay, Jayapura, Indonesia. Hydroacoustic data were processed using a threshold in the range of −90 dB to −70 dB which was used for plankton detection at a depth range of 5–100 m. The results of the current study showed that the surface temperature changed from 30 °C on the outside to 18 °C on the inside of the bay. Similarly, the salinity of the surface outside the bay was 36‰ while it was 18‰ inside the bay. The distribution of chlorophyll had also decreased, where the value outside the bay was 0.32 mg/m3 and inside the bay was 0.02 mg/m3. The horizontal distribution of the values of plankton's volume backscattering strength (Sv) had a range of −82 dB to −75 dB with an average of −76.63 dB. When the distribution of plankton's Sv was detected vertically, it showed that the value of plankton’s Sv decreased with increasing the water depth.
This study aims to determine the diversity, distribution, and ecological index of coral fish from... more This study aims to determine the diversity, distribution, and ecological index of coral fish from the Pomacentridae family in the coral reef ecosystem of Jayapura City. Reef fish observations were carried out in April 2020 at seven study sites. The fish observation was carried out at a depth of 3 to 5 m using the Underwater Visual Census method. Ecological indices were determined using PAST software (PAleontological Statistics) version 4.01, while the similarity index between study sites was determined using PRIMER 7 software. The results showed that the number of coral fish species of Pomacentridae family was 35 species with a total of 346 individual fish. The species distribution was very diverse and no fish species were found at all study sites. The diversity index ranges from 0.572 to 2.215 (low to moderate category), the evenness index ranges from 0.431 to 0.886 (medium to high category), and the dominance index ranges from 0.145 to 0.616 (low to moderate category). The diversi...
Ekosistem mangrove memiliki keanekaragaman hayati baik dari manfaat ekologi maupun sosial. Kondis... more Ekosistem mangrove memiliki keanekaragaman hayati baik dari manfaat ekologi maupun sosial. Kondisi mangrove di kawasan Taman Wisata Alam Teluk Youtefa, baik secara kualitatif maupun kuantitatif terus menurun dari tahun ke tahun. Penurunan kualitas mangrove menjadi perhatian serius seiring dengan penyusutan luasnya. Perubahan kerapatan tajuk merupakan salah satu indikasi untuk memantau kualitasnya. Seiring dengan berkembangnya citra satelit seri Landsat, maka pada penelitian ini dilakukan pengolahan citra Landsat 8 akuisisi tanggal 21 Januari 2017 untuk menganalisis sebaran dan kerapatan mangrove menggunakan analisis indeks vegetasi di Taman Wisata Alam Teluk Youtefa, Jayapura. Tahapan identifikasi mangrove dilakukan dengan menggunakan komposit band RGB 564, kemudian dilakukan pemisahan obyek mangrove, non-mangrove dan badan air dengan menggunakan metode klasifikasi supervised. Tahap selanjutnya adalah melakukan analisis kerapatan mangrove dengan menggunakan formula Normalized Differ...
Coral fish is one of the organisms associated with the most coral reefs and is a large organism t... more Coral fish is one of the organisms associated with the most coral reefs and is a large organism that can be found in all coral reef habitats. This study aims to determine the diversity of reef fish, community structure, and abundance of reef fish in the Depapre Bay Waters, Jayapura Regency. This research was conducted from September to October 2017 in Serebo and Kampung Tua waters. The method used is the Underwater Visual Census method at a depth of 3 to 5 m with a transect length of 75 m and an observation width of 5 m. A total of 69 species of reef fish found at the study site consisted of 16 reef fish families. The number of reef fish species at Serebo and Kampung Tua stations is 47 species and 38 species, respectively. The diversity index of reef fish ranged from 2.8264 to 2.9615 which was classified in the medium category. The uniformity index ranges from 0.7341 to 0.8142, which indicates that the community is relatively stable. The dominance index at Serebo Station is classifi...
Tsunami disaster has occurred in Jayapura coast for several times (1952, 1960, 1970, 1996, and th... more Tsunami disaster has occurred in Jayapura coast for several times (1952, 1960, 1970, 1996, and the last one in 2011). The mangrove ecosystem, a natural fortress, is very strong against the Tsunami waves. This study aims to implement and develop a conservation program for mangrove ecosystems in which to prevent and minimize the impact of the Tsunami disaster in Youtefa Bay, Jayapura City. This research was conducted on 2-6 July 2018 at Holtekamp Teluk Yotefa, Jayapura. There were three main activities: (1) mapping locations prone to tsunamis in the Holtekamp coast, (2) FGD (3) declarating of mangrove conservation activities and evalution. The level of understanding of the Holtekamp Village community represented by 21 participants was obtained at the beginning of the activity 95.2% of the people who understood the importance of the mangrove ecosystem. As many as 85.7% of participants were committed and able to protect, planted and managed mangrove forests again to ensure the Holtekamp...
The single beam echosounder CruzPro PcFF80 with 200 kHz of frequencies was used for recordings of... more The single beam echosounder CruzPro PcFF80 with 200 kHz of frequencies was used for recordings of coral acoustic backscattering. The objectives of this research are to analyze the backscattered signals and to determine the strength and characteristics of coral acoustic backscatters. Data collection was conducted in April 2013 which located in the Seribu Island waters. Acoustics data recording was carried out in Seribu Islands, using single beam echosounder (SBES) CruzPro PcFF80 with operating at 200 and 50 kHz frequencies. An underwater camera was used to validate the acoustic recordings data. The results show that average value of surface backscattering strength (SS) several type of coral at 200 kHz frequency varied between -17.99 dB up -14.65 dB, whereas at 50 kHz frequency varied between -13.33 dB up -9.22 dB. The use of different frequencies will greatly affect the high and low levels of absorption, so that affecting to acoustic backscatter strength.
Teluk Youtefa merupakan perairan yang potensial untuk penangkapan ikan demersal, terutama oleh ne... more Teluk Youtefa merupakan perairan yang potensial untuk penangkapan ikan demersal, terutama oleh nelayan lokal di sekitar Teluk Youtefa. Survei hidroakustik dilakukan untuk mengetahui distribusi target strength (TS) dan menduga ukuran panjang ikan demersal di perairan Teluk Youtefa. Perekaman data hidroakustik dilakukan sepanjang cruise track dengan menggunakan echosounder single beam SIMRAD EK-15 frekuensi 200 kHz. Analisis data menggunakan software Echoview 4.8, dengan threshold antara -34 sampai -70 dB dan ESDU adalah 100 ping. Ikan demersal pada penelitian ini merupakan ikan yang terdeteksi pada jarak maksimum 3 m dari dasar perairan. Hasil penelitian menujukkan bahwa ikan demersal yang terdeteksi sebanyak 27 schooling yang tersebar pada kedalaman 3,24–33,44 m. Ikan demersal yang terdeteksi dominan pada kedalaman maksimum 10 m sebanyak 21 schooling. Nilai TS rata-rata ikan demersal berkisar antara -69,58 dB sampai -45,87 dB. Berdasakan nilai TS yang diperoleh, ikan demersal di per...
Chlorophyll-a is one of the parameters determining the primary productivity of water. In the fish... more Chlorophyll-a is one of the parameters determining the primary productivity of water. In the fisheries sector, information on chlorophyll-a concentration in marine waters is very important for the prediction of fishing grounds. This study aims to analyze the variability of chlorophyll-a concentrations in Cenderawasih Bay and the surrounding waters, both spatial and temporal variability. Data from the Aqua-MODIS Level 3 monthly composite period from January to December 2019 was used to determine the concentration of chlorophyll-a. Time-series data are used to determine fluctuations of chlorophyll-a concentrations, while interpolation with the kriging method is used to determine the spatial distribution of chlorophyll-a. The analysis showed that the monthly average value of chlorophyll-a concentration in the study area ranged from 0.1988 – 0.3415 mg.m-3. The average value of chlorophyll-a concentration increases from March to June and then decreases in July or August. The highest aver...
The accumulation of phytoplankton biomass measured as chlorophyll-a is highly depends on the avai... more The accumulation of phytoplankton biomass measured as chlorophyll-a is highly depends on the availability of ammonia and silicate in the waters. The purpuses of the study were examining the concentration of chlorophyll-a and its relation with ammonia and silicate in the waters of Doreri Bay, Manokwari Regency, West Papua Province. Water sampling is carried out at 10 stations. Parameters measured include chlorophyll-a, ammonia and silicate. The measurement results of chlorophyll-a concentration ranged from 0.23-3.77 μg/L with an meanof 0.82 μg/L. Ammonia and silicate concentrations ranged from 2.35-4.11 μM with an mean of 2.64 μM and 2.00-7.50 μM with an mean of 3.91 μM, respectively. The relationships of chlorophyll-a concentration with ammonia and silicate showed positive and negative relationships, respectively. Akumulasi biomasa fitoplankton yang diukur sebagai klorofil-a sangat tergantung pada ketersediaan amonia dan silikat di perairan. Penelitian bertujuan untuk mengetahui ko...
Penelitian ini bertujuan untuk menganalisis nilai hambur balik permukaan dasar perairan berupa pa... more Penelitian ini bertujuan untuk menganalisis nilai hambur balik permukaan dasar perairan berupa pasir dan lumpur. Echosounder bim tunggal Simrad EK15 frekuensi 200 kHz digunakan untuk perekaman hambur balik akustik permukaan dasar perairan. Pengambilan data dilakukan pada bulan tanggal 29 April – 2 Mei 2017 yang berlokasi di perairan Teluk Yos Sudarso, Kota Jayapura Provinsi Papua. Pengambilan contoh substrat digunakan untuk data validasi menggunakan sedimen grab. Hasil penelitian ini menggambarkan nilai rata-rata hambur balik permukaan substrat perairan pasir bervariasi antara -37.48 dB sampai -36.03 dB, dan lumpur bervariasi antara -46.98 dB sampai -45.15 dB. Hal ini juga menunjukkan bahwa substrat pasir memiliki tingkat kekerasan dan ukuran butir yang lebih besar dibandingkan jenis substrat lumpur substrat. Secara akustik, nilai hambur balik permukaan pasir akan lebih tinggi dibandingkan lumpur
In this study, we used data on the length and weight of fish to determine the length-weight relat... more In this study, we used data on the length and weight of fish to determine the length-weight relationship and condition factors of eight commercial fish targeted by traditional Papuan fishers in Youtefa Bay, Papua Province, Indonesia. The fish species were Lutjanus fulvus, Gerres oyena, Parupeneus barberinus, Siganus spinus, Siganus canaliculatus, Pelates quadrilineatus. Mugil cephalus, and Hemiramphus far. A total of 245 fish specimens were collected from Papuan fishermen from January to March 2020. The total body length and weight ranged from 15.2 to 32.1 cm (average 20.26±3.73 cm) and 42.72 to 371.86 gr (average 124.10±52.45 gr), respectively. The b value ranged from 2.692 to 3.079, with the coefficient of determination (R2) ranging from 0.902 to 0.995. The growth patterns of the eight fish species were allometric (b≠3; t-test3). The relative condition factor and Fulton condition factor values ranged from 0.874 to 1.201 (average 0.999±0.321) and 0.204 to 2.726 (average 1.612±0.515...
Journal of tropical biodiversity and biotechnology, Sep 14, 2022
As one of the marine areas included in the world's Coral Triangle region, Yos Sudarso Bay have a ... more As one of the marine areas included in the world's Coral Triangle region, Yos Sudarso Bay have a potential reef fish diversity that needs to be studied. However, there is very little information about reef fish diversity in these waters to date. This study aims to determine the species diversity of reef fish in Yos Sudarso Bay, Jayapura City, Indonesia. The study was conducted in April 2020 at seven sites; six of them located inside the Yos Sudarso Bay and one more located outside the bay. Sampling was carried out using the Underwater Visual Census method (25 m long and 5 m wide). Relative abundance by species, and diversity (H´), evenness (E), and dominance (C) indices were calculated. A total of 1,075 individual reef fish was recorded in seven study sites, representing 122 species and 26 families. Locations showed differences in reef fish abundance (86 to 215 individuals/125 m 2), diversity (H´= 2.462 to 3.358), evenness (E = 0.770 to 0.887), and dominance (C = 0.047 to 0.155). This study has provided preliminary information on species diversity, fish abundance, and the ecological index of reef fish in Yos Sudarso Bay, Jayapura City.
Monitoring shoreline changes is important in detecting abrasion and accretion in coastal areas. T... more Monitoring shoreline changes is important in detecting abrasion and accretion in coastal areas. This study aimed to determine the level of shoreline change caused by abrasion and accretion and estimate the change rate. The study area covers coastal areas in ten Districts in Biak Numfor Regency (only on Biak Island). Six Landsat image datasets (1997, 2002, 2007, 2013, 2018, and 2022) were used to determine the coastline. Shoreline changes were analysed using DSAS software. The results of digitising the shoreline show a change in the length of the shoreline during the six data periods. Based on NSM and EPR for the last ten years (2013-2022), the average shoreline changes due to abrasion range from -6.65 to -13.16 m with an abrasion rate of -0.76 to -1.50 m/year. Meanwhile, the average shoreline changes due to accretion ranged from 4.64 to 8.45 m with an accretion rate of 0.53 m/year to 0.96 m/year. Changes in shoreline based on the rate of abrasion and accretion vary greatly in each d...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Terumbu karang memiliki fungsi, peranan dan manfaat, baik secara langsung maupun tidak langsung b... more Terumbu karang memiliki fungsi, peranan dan manfaat, baik secara langsung maupun tidak langsung bagi masyarakat yang tinggal di wilayah pesisir. Secara ekologi terumbu karang bermanfaat sebagai sumber makanan, habitat, tempat berkembang biak dan tempat hidup bagi berbagai oarganisme. Penelitian ini bertujuan untuk mengetahui jenis-jenis lifeform tutupan karang, persentase terumbu karang dan parameter fisik-kimia perairan Teluk Tanah Merah Distrik Depapre. Pengambilan data selama 7 bulan dari bulan Oktober 2017 sampai April 2018. Metode pengamatan terumbu karang yang digunakan adalah observasi dan Point Intercept Transect (PIT) pada kedalaman 3 m dan 10 m. Hasil penelitian menunjukkan bahwa terdapat 5 tipe lifeform karang Acropora di perairan Teluk Tanah Merah yaitu Acropora encrusting (ACE), Acropora submassive (ACS), Acropora digitate (ACD), Acropora branching (ACB,) dan Acropora tabulate (ACT), serta 9 jenis non-Acropora yaitu Coral branching (CB), Coral massive (CM), Coral subma...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Ekosistem terumbu karang memiliki nilai dan arti yang penting baik dari segi ekologi, sosial, eko... more Ekosistem terumbu karang memiliki nilai dan arti yang penting baik dari segi ekologi, sosial, ekonomi maupun budaya masyarakat. Keberadaan ekosistem terumbu karang dapat berdampak pada ekonomi dan pengembangan wilayah pesisir. Penelitian ini bertujuan untuk mengetahui kondisi tutupan karang hidup dan nilai manfaat ekonomi dari ekosistem terumbu karang di perairan Tablasupa. Pengamatan kondisi tutupan karang hidup dilakukan dangan menggunakan metode Point Intersept Trasect (PIT) pada kedalaman 3 m di 2 stasiun penelitian. Sedangkan nilai manfaat ekonomi ekosistem terumbu karang diperoleh dengan menggunakan konsep valuasi ekonomi untuk menghitung nilai manfaat secara langsung maupun manfaat tidak langsung dari potensi ekosistem terumbu karang yang ada. Hasil penelitian ini menunjukkan bahwa secara umum kondisi tutupan karang hidup di perairan Tablasupa berada dalam kategori sedang hingga baik dengan tutupan karang hidup berkisar antara 34,0% - 52,5%. Jenis karang hidup yang dominan ad...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Ekosistem mangrove Teluk Youtefa memiliki peranan yang sangat vital terhadap kelangsungan hidup p... more Ekosistem mangrove Teluk Youtefa memiliki peranan yang sangat vital terhadap kelangsungan hidup penduduk Kota Jayapura, teristimewa masyarakat pesisir yang bermukim di sepanjang garis pantai teluk ini. Kegiatan ini dilakukan sebagai salah satu bentuk kepedulian kampus untuk mendukung pemerintah dalam upaya pelesteraian ekosistem mangrove Holte Camp. Kegiatan ini dilakukan dengan metode: 1). Observasi lokasi; 2). Diskusi Kelompok Terpadu (DKP); 3). Penyuluhan Perikanan Peduli Ekositem Mangrove Berkelanjutan; 4). Evaluasi Kegiatan. Kegiatan ini diselenggarakan pada hari Sabtu tanggal 9 September 2017 di Kantor Desa Holte Camp dengan jumlah peserta sebanyak 22 orang. Hasil kegiatan diskusi perencanaan pengelolaan ekosistem mangrove, dari 59,1% masyarakat yang paham pengelolaan ekosistem mangrove kemudian meningkat menjadi 86,4% setelah mengikuti kegiatan. Dari 77,2% peserta berkomitmen akan merencanakan pengelolaan ekosistem mangrove di pantai Holte Camp dan akan membantu orang lain da...
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua
Salah satu karakteristik perairan Mimika adalah banyaknya sungai-sungai besar yang bermuara di wi... more Salah satu karakteristik perairan Mimika adalah banyaknya sungai-sungai besar yang bermuara di wilayah perairan Mimika yang mempengaruhi berbagai aktivitas, salah satunya adalah aktivitas transportasi kapal berukuran besar yang akan masuk dan keluar di pelabuhan Poumako dan Port Site-Freeport harus melalui sungai dan sangat bergantung pada proses pasang surut air laut. Penelitian ini bertujuan untuk mengetahui dan mengkaji karakteristik pasang surut di perairan Mimika, Provinsi Papua. Data yang digunakan adalah data pasang surut selama 29 hari dengan interval pengamatan 1 jam. Penentuan tipe pasang surut dan tinggi muka air rata-rata dengan menggunakan metode Least-Squares. Hasil pengolahan data menunjukkan bahwa tipe pasang surut di perairan Mimika adalah pasang surut campuran condong ke harian tunggal dengan bilangan Formzahl 2,9498. Hal ini berarti bahwa pada perairan Mimika dalam sehari terjadi satu kali atau dua kali pasang dengan interval tinggi air laut yang berbeda. Adapun n...
A study was conducted to estimate the distribution and density of demersal fish in Youtefa Bay, P... more A study was conducted to estimate the distribution and density of demersal fish in Youtefa Bay, Papua, Indonesia, using hydroacoustic technology. The hydroacoustic survey was carried out using a single beam echosounder SIMRAD EK-15 which operates at a frequency of 200 kHz. The hydroacoustic data was processed using Echoview software with a threshold between -70.00 to -34.00 dB. Schooling fish were detected at a maximum distance of 3 m from the seabed, with average volume backscattering strength ranging between -60.13 and -42.01 dB. The demersal fish density in the Youtefa Bay ranged from 0.09 to 42.19 fish m-3 with an average density of 12.62 fish m-3. The schools of demersal fish were dominantly detected in the coastal waters of Enggros Village to Abe Pantai Village. The condition of substrate and water depth seems to influence the spatial and vertical distribution of demersal fish in the Youtefa Bay.
This study aims to assess and quantify the economic value of coastal ecosystem services (CES) in ... more This study aims to assess and quantify the economic value of coastal ecosystem services (CES) in the coastal areas of Jayapura City based on the perceptions of Papuan indigenous peoples. Data collection was conducted from March to April 2018 using the direct interview method based on questionnaires to 228 respondents in Enggros, Tobati, and Nafri villages. The CES value in Jayapura City is estimated to be around USD 5,427,212.34/year, which consists of service values of mangrove, coral reef, and seagrass ecosystems that are USD 4,447,802.85/year or USD 19,079.46/ha/year, USD 424,333.06/year or USD 11,303.49/ha/year, and USD 555,076.43/year or 5,008.36/ha/year, respectively. The value of CES as a provider of fishery products is quite high because of the high desire of the community to exploit and utilize natural resources such as fish, crabs, shrimp, and shellfish in coastal ecosystems to as a food resource. Therefore, with the description of the CES value in this study, good coastal...
Abstract The present study combined the data of environmental parameters and plankton distributio... more Abstract The present study combined the data of environmental parameters and plankton distribution using hydroacoustic technology with the purpose to map the horizontal and vertical distribution of plankton in Yos Sudarso Bay, Jayapura, Indonesia. Hydroacoustic data were processed using a threshold in the range of −90 dB to −70 dB which was used for plankton detection at a depth range of 5–100 m. The results of the current study showed that the surface temperature changed from 30 °C on the outside to 18 °C on the inside of the bay. Similarly, the salinity of the surface outside the bay was 36‰ while it was 18‰ inside the bay. The distribution of chlorophyll had also decreased, where the value outside the bay was 0.32 mg/m3 and inside the bay was 0.02 mg/m3. The horizontal distribution of the values of plankton's volume backscattering strength (Sv) had a range of −82 dB to −75 dB with an average of −76.63 dB. When the distribution of plankton's Sv was detected vertically, it showed that the value of plankton’s Sv decreased with increasing the water depth.
This study aims to determine the diversity, distribution, and ecological index of coral fish from... more This study aims to determine the diversity, distribution, and ecological index of coral fish from the Pomacentridae family in the coral reef ecosystem of Jayapura City. Reef fish observations were carried out in April 2020 at seven study sites. The fish observation was carried out at a depth of 3 to 5 m using the Underwater Visual Census method. Ecological indices were determined using PAST software (PAleontological Statistics) version 4.01, while the similarity index between study sites was determined using PRIMER 7 software. The results showed that the number of coral fish species of Pomacentridae family was 35 species with a total of 346 individual fish. The species distribution was very diverse and no fish species were found at all study sites. The diversity index ranges from 0.572 to 2.215 (low to moderate category), the evenness index ranges from 0.431 to 0.886 (medium to high category), and the dominance index ranges from 0.145 to 0.616 (low to moderate category). The diversi...
Ekosistem mangrove memiliki keanekaragaman hayati baik dari manfaat ekologi maupun sosial. Kondis... more Ekosistem mangrove memiliki keanekaragaman hayati baik dari manfaat ekologi maupun sosial. Kondisi mangrove di kawasan Taman Wisata Alam Teluk Youtefa, baik secara kualitatif maupun kuantitatif terus menurun dari tahun ke tahun. Penurunan kualitas mangrove menjadi perhatian serius seiring dengan penyusutan luasnya. Perubahan kerapatan tajuk merupakan salah satu indikasi untuk memantau kualitasnya. Seiring dengan berkembangnya citra satelit seri Landsat, maka pada penelitian ini dilakukan pengolahan citra Landsat 8 akuisisi tanggal 21 Januari 2017 untuk menganalisis sebaran dan kerapatan mangrove menggunakan analisis indeks vegetasi di Taman Wisata Alam Teluk Youtefa, Jayapura. Tahapan identifikasi mangrove dilakukan dengan menggunakan komposit band RGB 564, kemudian dilakukan pemisahan obyek mangrove, non-mangrove dan badan air dengan menggunakan metode klasifikasi supervised. Tahap selanjutnya adalah melakukan analisis kerapatan mangrove dengan menggunakan formula Normalized Differ...
Coral fish is one of the organisms associated with the most coral reefs and is a large organism t... more Coral fish is one of the organisms associated with the most coral reefs and is a large organism that can be found in all coral reef habitats. This study aims to determine the diversity of reef fish, community structure, and abundance of reef fish in the Depapre Bay Waters, Jayapura Regency. This research was conducted from September to October 2017 in Serebo and Kampung Tua waters. The method used is the Underwater Visual Census method at a depth of 3 to 5 m with a transect length of 75 m and an observation width of 5 m. A total of 69 species of reef fish found at the study site consisted of 16 reef fish families. The number of reef fish species at Serebo and Kampung Tua stations is 47 species and 38 species, respectively. The diversity index of reef fish ranged from 2.8264 to 2.9615 which was classified in the medium category. The uniformity index ranges from 0.7341 to 0.8142, which indicates that the community is relatively stable. The dominance index at Serebo Station is classifi...
Tsunami disaster has occurred in Jayapura coast for several times (1952, 1960, 1970, 1996, and th... more Tsunami disaster has occurred in Jayapura coast for several times (1952, 1960, 1970, 1996, and the last one in 2011). The mangrove ecosystem, a natural fortress, is very strong against the Tsunami waves. This study aims to implement and develop a conservation program for mangrove ecosystems in which to prevent and minimize the impact of the Tsunami disaster in Youtefa Bay, Jayapura City. This research was conducted on 2-6 July 2018 at Holtekamp Teluk Yotefa, Jayapura. There were three main activities: (1) mapping locations prone to tsunamis in the Holtekamp coast, (2) FGD (3) declarating of mangrove conservation activities and evalution. The level of understanding of the Holtekamp Village community represented by 21 participants was obtained at the beginning of the activity 95.2% of the people who understood the importance of the mangrove ecosystem. As many as 85.7% of participants were committed and able to protect, planted and managed mangrove forests again to ensure the Holtekamp...
The single beam echosounder CruzPro PcFF80 with 200 kHz of frequencies was used for recordings of... more The single beam echosounder CruzPro PcFF80 with 200 kHz of frequencies was used for recordings of coral acoustic backscattering. The objectives of this research are to analyze the backscattered signals and to determine the strength and characteristics of coral acoustic backscatters. Data collection was conducted in April 2013 which located in the Seribu Island waters. Acoustics data recording was carried out in Seribu Islands, using single beam echosounder (SBES) CruzPro PcFF80 with operating at 200 and 50 kHz frequencies. An underwater camera was used to validate the acoustic recordings data. The results show that average value of surface backscattering strength (SS) several type of coral at 200 kHz frequency varied between -17.99 dB up -14.65 dB, whereas at 50 kHz frequency varied between -13.33 dB up -9.22 dB. The use of different frequencies will greatly affect the high and low levels of absorption, so that affecting to acoustic backscatter strength.
Teluk Youtefa merupakan perairan yang potensial untuk penangkapan ikan demersal, terutama oleh ne... more Teluk Youtefa merupakan perairan yang potensial untuk penangkapan ikan demersal, terutama oleh nelayan lokal di sekitar Teluk Youtefa. Survei hidroakustik dilakukan untuk mengetahui distribusi target strength (TS) dan menduga ukuran panjang ikan demersal di perairan Teluk Youtefa. Perekaman data hidroakustik dilakukan sepanjang cruise track dengan menggunakan echosounder single beam SIMRAD EK-15 frekuensi 200 kHz. Analisis data menggunakan software Echoview 4.8, dengan threshold antara -34 sampai -70 dB dan ESDU adalah 100 ping. Ikan demersal pada penelitian ini merupakan ikan yang terdeteksi pada jarak maksimum 3 m dari dasar perairan. Hasil penelitian menujukkan bahwa ikan demersal yang terdeteksi sebanyak 27 schooling yang tersebar pada kedalaman 3,24–33,44 m. Ikan demersal yang terdeteksi dominan pada kedalaman maksimum 10 m sebanyak 21 schooling. Nilai TS rata-rata ikan demersal berkisar antara -69,58 dB sampai -45,87 dB. Berdasakan nilai TS yang diperoleh, ikan demersal di per...
Chlorophyll-a is one of the parameters determining the primary productivity of water. In the fish... more Chlorophyll-a is one of the parameters determining the primary productivity of water. In the fisheries sector, information on chlorophyll-a concentration in marine waters is very important for the prediction of fishing grounds. This study aims to analyze the variability of chlorophyll-a concentrations in Cenderawasih Bay and the surrounding waters, both spatial and temporal variability. Data from the Aqua-MODIS Level 3 monthly composite period from January to December 2019 was used to determine the concentration of chlorophyll-a. Time-series data are used to determine fluctuations of chlorophyll-a concentrations, while interpolation with the kriging method is used to determine the spatial distribution of chlorophyll-a. The analysis showed that the monthly average value of chlorophyll-a concentration in the study area ranged from 0.1988 – 0.3415 mg.m-3. The average value of chlorophyll-a concentration increases from March to June and then decreases in July or August. The highest aver...
The accumulation of phytoplankton biomass measured as chlorophyll-a is highly depends on the avai... more The accumulation of phytoplankton biomass measured as chlorophyll-a is highly depends on the availability of ammonia and silicate in the waters. The purpuses of the study were examining the concentration of chlorophyll-a and its relation with ammonia and silicate in the waters of Doreri Bay, Manokwari Regency, West Papua Province. Water sampling is carried out at 10 stations. Parameters measured include chlorophyll-a, ammonia and silicate. The measurement results of chlorophyll-a concentration ranged from 0.23-3.77 μg/L with an meanof 0.82 μg/L. Ammonia and silicate concentrations ranged from 2.35-4.11 μM with an mean of 2.64 μM and 2.00-7.50 μM with an mean of 3.91 μM, respectively. The relationships of chlorophyll-a concentration with ammonia and silicate showed positive and negative relationships, respectively. Akumulasi biomasa fitoplankton yang diukur sebagai klorofil-a sangat tergantung pada ketersediaan amonia dan silikat di perairan. Penelitian bertujuan untuk mengetahui ko...
Penelitian ini bertujuan untuk menganalisis nilai hambur balik permukaan dasar perairan berupa pa... more Penelitian ini bertujuan untuk menganalisis nilai hambur balik permukaan dasar perairan berupa pasir dan lumpur. Echosounder bim tunggal Simrad EK15 frekuensi 200 kHz digunakan untuk perekaman hambur balik akustik permukaan dasar perairan. Pengambilan data dilakukan pada bulan tanggal 29 April – 2 Mei 2017 yang berlokasi di perairan Teluk Yos Sudarso, Kota Jayapura Provinsi Papua. Pengambilan contoh substrat digunakan untuk data validasi menggunakan sedimen grab. Hasil penelitian ini menggambarkan nilai rata-rata hambur balik permukaan substrat perairan pasir bervariasi antara -37.48 dB sampai -36.03 dB, dan lumpur bervariasi antara -46.98 dB sampai -45.15 dB. Hal ini juga menunjukkan bahwa substrat pasir memiliki tingkat kekerasan dan ukuran butir yang lebih besar dibandingkan jenis substrat lumpur substrat. Secara akustik, nilai hambur balik permukaan pasir akan lebih tinggi dibandingkan lumpur
Uploads
Papers by Baigo Hamuna