Because of its characteristics and high market price, efforts are being made to introduce the Eur... more Because of its characteristics and high market price, efforts are being made to introduce the European squid Loligo vulgaris into aquaculture. The results of previous trials to rear different stages of the squid did not satisfy the needs of commercial culture. In this study, three live females of L. vulgaris were jigged from the shore in front of the Institute of Oceanography and Fisheries in Split, Croatia (northern Mediterranean Sea) in May 2002. After a short time in captivity the squids spawned spontaneously, leaving their strands on the water exchange pipe immersed in the pool. On day 21 after spawning, the first hatchlings were observed. The paralarvae were fed small fish pellets and brine shrimp Artemia salina in open circuit aquaria and glass pots, but died after eight days. For economic production and rearing, more sophisticated studies are needed, concentrating on nutritional requirements and balanced diet of early development stages.
Metacercariae of the digenetic trematode Clinostomum complanatum Rudolphi, 1814 were observed in ... more Metacercariae of the digenetic trematode Clinostomum complanatum Rudolphi, 1814 were observed in chub (Squalius cephalus) and common carp (Cyprinus carpio) from the Orljava River (Croatia). Both the prevalence and infection intensity were higher in the chub (prevalence 23.4%, average intensity 70.5) than in the common carp (5.9%, 4.5). In general, the metacercariae were located in the wall of the anterior part of the digestive tract and branchial cavity, the supraocular region, and the hypaxial musculature near the paired fins. Histology revealed the obvious affinity of the parasite for striated muscles and connective tissue. In situ, the metacercariae were surrounded by wellvascularized connective tissue capsules composed primarily of collagen fibers, fibroblasts, and fibrocytes. This study provides some insight into the parasite’s pathogenicity and the relationship between host and parasite.
Arhiv za higijenu rada i toksikologiju (Archives of industrial hygiene and toxicology) - Abstracts of the 6th Croatian Congress of Toxicology with International Participation (CROTOX 2021), Vol. 72/Suppl.1, 2021
Određivanje fekalnih pokazatelja se koristi za procjenu prisutnosti patogenih bakterija i virusa.... more Određivanje fekalnih pokazatelja se koristi za procjenu prisutnosti patogenih bakterija i virusa. Ukupni koliformi se koriste kao pokazatelji fekalnog oneciscenja, iako ne potjecu iz fecesa. Međutim, Esherichia coli je uvijek u fecesu te je zbog toga izravni pokazatelj fekalnog oneciscenja i moguce prisutnosti patogena. Eutrofikacija u rijekama podržava povecanje gustoce bakterija, sto se odražava na mikrofloru riba. U rijecnim vodotocima, Korane i Mrežnice, stuka (Esox lucius L.) je tijekom istraživanja u 2012. godini predstavljala jednu od najbrojnijih ribljih vrsta (oko 60%). Stuka je grabežljivac, a zbog svoje rasprostranjenosti cesto je koristena u istraživanjima oneciscenja vodenog okolisa. Cilj ovog istraživanja bio je preliminarno istražiti bakterioloska svojstva rijecne vode: Korane i Mrežnice, s aspekta određivanja prisutnosti fekalnih pokazatelja te njihovog utjecaja na formiranje bakterijske zajednice stuke. Uzorkovanja su provedena na dvije rijeke: Korani i Mrežnici u s...
... Zvjezdana; Roman, Zdenko. Title: Program praćenja stanja slatkovodnog ribarstva u 2009. godin... more ... Zvjezdana; Roman, Zdenko. Title: Program praćenja stanja slatkovodnog ribarstva u 2009. godini – Grupa D - Ribolovno područje Sava ; Rijeka Sutla ( Monitoring of freshwater fishery in 2009 - Group D - Fishing area Sava River ; Sutla River ). Source: Institut Ruđer Bošković. ...
Because of its characteristics and high market price, efforts are being made to introduce the Eur... more Because of its characteristics and high market price, efforts are being made to introduce the European squid Loligo vulgaris into aquaculture. The results of previous trials to rear different stages of the squid did not satisfy the needs of commercial culture. In this study, three live females of L. vulgaris were jigged from the shore in front of the Institute of Oceanography and Fisheries in Split, Croatia (northern Mediterranean Sea) in May 2002. After a short time in captivity the squids spawned spontaneously, leaving their strands on the water exchange pipe immersed in the pool. On day 21 after spawning, the first hatchlings were observed. The paralarvae were fed small fish pellets and brine shrimp Artemia salina in open circuit aquaria and glass pots, but died after eight days. For economic production and rearing, more sophisticated studies are needed, concentrating on nutritional requirements and balanced diet of early development stages.
Metacercariae of the digenetic trematode Clinostomum complanatum Rudolphi, 1814 were observed in ... more Metacercariae of the digenetic trematode Clinostomum complanatum Rudolphi, 1814 were observed in chub (Squalius cephalus) and common carp (Cyprinus carpio) from the Orljava River (Croatia). Both the prevalence and infection intensity were higher in the chub (prevalence 23.4%, average intensity 70.5) than in the common carp (5.9%, 4.5). In general, the metacercariae were located in the wall of the anterior part of the digestive tract and branchial cavity, the supraocular region, and the hypaxial musculature near the paired fins. Histology revealed the obvious affinity of the parasite for striated muscles and connective tissue. In situ, the metacercariae were surrounded by wellvascularized connective tissue capsules composed primarily of collagen fibers, fibroblasts, and fibrocytes. This study provides some insight into the parasite’s pathogenicity and the relationship between host and parasite.
Arhiv za higijenu rada i toksikologiju (Archives of industrial hygiene and toxicology) - Abstracts of the 6th Croatian Congress of Toxicology with International Participation (CROTOX 2021), Vol. 72/Suppl.1, 2021
Određivanje fekalnih pokazatelja se koristi za procjenu prisutnosti patogenih bakterija i virusa.... more Određivanje fekalnih pokazatelja se koristi za procjenu prisutnosti patogenih bakterija i virusa. Ukupni koliformi se koriste kao pokazatelji fekalnog oneciscenja, iako ne potjecu iz fecesa. Međutim, Esherichia coli je uvijek u fecesu te je zbog toga izravni pokazatelj fekalnog oneciscenja i moguce prisutnosti patogena. Eutrofikacija u rijekama podržava povecanje gustoce bakterija, sto se odražava na mikrofloru riba. U rijecnim vodotocima, Korane i Mrežnice, stuka (Esox lucius L.) je tijekom istraživanja u 2012. godini predstavljala jednu od najbrojnijih ribljih vrsta (oko 60%). Stuka je grabežljivac, a zbog svoje rasprostranjenosti cesto je koristena u istraživanjima oneciscenja vodenog okolisa. Cilj ovog istraživanja bio je preliminarno istražiti bakterioloska svojstva rijecne vode: Korane i Mrežnice, s aspekta određivanja prisutnosti fekalnih pokazatelja te njihovog utjecaja na formiranje bakterijske zajednice stuke. Uzorkovanja su provedena na dvije rijeke: Korani i Mrežnici u s...
... Zvjezdana; Roman, Zdenko. Title: Program praćenja stanja slatkovodnog ribarstva u 2009. godin... more ... Zvjezdana; Roman, Zdenko. Title: Program praćenja stanja slatkovodnog ribarstva u 2009. godini – Grupa D - Ribolovno područje Sava ; Rijeka Sutla ( Monitoring of freshwater fishery in 2009 - Group D - Fishing area Sava River ; Sutla River ). Source: Institut Ruđer Bošković. ...
Uploads
Papers by Damir Valic