Scallop

For verb senses, see Scalloping. For potato scallops, see Potato cake. For the cut of meat, see Escalope. For the scallop shell moth, see Rheumaptera undulata.

Scallop Temporal range: Middle Triassic–Present PreЄ Є O S D C P T J K Pg N
Argopecten irradians, the Atlantic Bay scallop
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Subclass:	Pteriomorphia
Order:	Pectinoida
Suborder:	Pectinina
Superfamily:	Pectinoidea
Family:	Pectinidae Wilkes, 1810
Genera
See text

The characteristic fan shape of a scallop shell (Pecten albicans). Scallops can swim with brief bursts of speed by clapping their shells together.

Live Placopecten magellanicus, the Atlantic deep-sea scallop. Bordering the edge of its mantle are over 100 simple eyes

Scallop (/ˈskɒləp/ or /ˈskæləp/) is a common name that is primarily applied to any one of numerous species of saltwater clams or marine bivalve mollusks in the taxonomic family Pectinidae, the scallops. However, the common name "scallop" is also sometimes applied to species in other closely related families within the superfamily Pectinoidea.

Scallops are a cosmopolitan family of bivalves, found in all of the world's oceans, though never in freshwater. They are one of very few groups of bivalves to be primarily "free-living"; many species are capable of rapidly swimming short distances and even of migrating some distance across the ocean floor. A small minority of scallop species live cemented to rocky substrates as adults, while others are more simply attached by means of a filament they secrete called a byssal thread. The majority of species, however, live recumbent on sandy substrates, and when they sense the presence of a predator such as a starfish, they are able to escape by swimming swiftly but erratically through the water using a form of jet propulsion created by repeatedly clapping of their shells together. Scallops have a well-developed nervous system, and unlike most other bivalves they have numerous simple eyes situated around the edge of their mantles.

Many species of scallops are highly prized as a food source, and some are farmed as aquaculture. The word "scallop" is also applied to the meat of these bivalves when it is sold as seafood. In addition the name "scallop" is used as part of the name of dishes based on the meat of scallops, and is even applied to some dishes not containing scallop at all but which are prepared in a similar fashion. The brightly colored, symmetrical, fan-shaped shells of scallops with their radiating and often fluted sculpture are valued by shell collectors, and have been used since ancient times as motifs in art, architecture and design.

Scallops do produce pearls, though which do not have the buildup of layers, or “nacre”, and may not have luster or iridescence. They can be dull, small and of varying color, but there are exceptions that are appreciated for their aesthetic qualities.

Anatomy

There is very little variation in the internal arrangement of organs and systems within the scallop family, and what follows can be taken to apply to the anatomy of any given scallop species.

Orientation

Anatomical diagram of a typical hermaphroditic scallop with the left (i.e., upper) valve removed.

The shell of a scallop consists of two sides or valves, a left valve and a right one, divided by a plane of symmetry. Most species of scallop rest on their right valve, and consequently this valve is often shaped differently than the left (i.e., upper) valve. With the hinge of the two valves oriented as shown in the diagram at right, the left side of the image corresponds to the animal's morphological anterior or front, the right is the posterior or rear, the hinge is the dorsal or back/ top region, and the bottom corresponds to the ventral or (as it were) underside/ belly. However, as many scallop shells are more or less bilaterally symmetrical ("equivalved") as well as symmetrical front/back ("equilateral"), determining which way a given animal is "facing" requires detailed information about its valves.

Valves

The model scallop shell consists of two similarly shaped valves with a straight hinge line along the top devoid of teeth and which produces a pair of flat wings or "ears" (sometimes called "auricles", though this is also the term for two chambers in its heart) on either side of its midpoint. These ears may be of similar size and shape, or the anterior ear may be somewhat larger (the posterior ear is never larger than the anterior one). As is the case in almost all bivalves, a series of lines and/ or growth rings originate at the center of the hinge, at a spot called the beak surrounded by a generally raised area called the umbo. These growth rings increase in size downwards until they reach the curved ventral edge of the shell. The shell of most scallops is streamlined to facilitate ease of movement during swimming at some point in the life cycle, while also providing protection from predators. Scallops with ridged valves have the advantage of the architectural strength provided by these ridges called ribs, although the ribs are somewhat costly in terms of weight and mass. A feature that is unique to the members of the scallop family is the presence, at some point during the animal's life cycle, of a distinctive shell feature, a comb-like structure called a ctenolium located on the anterior edge of the right valve next to the byssal notch. Though many scallops lose this feature as they become free-swimming adults, all scallops have a ctenolium at some point during their lives, and no other bivalve has an analogous shell feature. The ctenolium is found in modern scallops only; the ancestors of modern scallops, the entoliids, did not possess it.

Muscular system

A live opened scallop showing the internal anatomy: The pale orange circular part is the adductor muscle; the darker orange curved part is the "coral", a culinary term for the ovary or roe.

Like the true oysters (family Ostreidae), scallops have a single central adductor muscle, thus the inside of their shells has a characteristic central scar, marking the point of attachment for this muscle. The adductor muscle of scallops is larger and more developed than those of oysters, because scallops are active swimmers; some species of scallops are known to move en masse from one area to another. In scallops, the shell shape tends to be highly regular, and is commonly used as an archetypal form of a seashell.

Eyes

Macro photo of a scallop showing some of its bright blue eyes.

Scallops have a large number (~10-100) of small (~1mm) eyes arranged along the edge of their mantle. These eyes represent a particular innovation among molluscs, relying on a concave, parabolic mirror of guanine crystals to focus and retro-reflect light instead of a lens as found in many other eye types. Additionally, their eyes possess a double-layered retina, the outer retina responding most strongly to light and the inner to abrupt darkness. While these eyes are unable to resolve shapes with high fidelity, the combined sensitivity of both retinas to light entering the eye and light retro-reflected from the mirror grants scallops exceptional contrast definition as well as the ability to detect changing patterns of light and motion. Scallops primarily rely on their eyes as an 'early-warning' threat detection system, scanning around them for movement and shadows which could potentially indicate predators. Additionally, some scallops alter their swimming or feeding behavior based on the turbidity or clarity of the water, by detecting the movement of particulate matter in the water column.

Digestive system

Scallops are filter feeders, and eat plankton. Unlike many other bivalves, they lack siphons. Water moves over a filtering structure, where food particles become trapped in mucus. Next, the cilia on the structure move the food toward the mouth. Then, the food is digested in the digestive gland, an organ sometimes misleadingly referred to as the "liver", but which envelops part of the esophagus, intestine, and the entire stomach. Waste is passed on through the intestine (the terminus of which, like that of many mollusks, enters and leaves the animal's heart) and exits via the anus.

Nervous system

Neural map of a giant scallop

Like all bivalves, scallops lack actual brains. Instead, their nervous system is controlled by three paired ganglia located at various points throughout their anatomy, the cerebral or cerebropleural ganglia, the pedal ganglia, and the visceral or parietovisceral ganglia. All are yellowish in color. The visceral ganglia are by far the largest and most extensive of the three, and occur as an almost-fused mass near the center of the animal— proportionally, these are the largest and most intricate set of ganglia of any modern bivalve. From these radiate all of the nerves which connect the visceral ganglia to the circumpallial nerve ring which loops around the mantle and connects to all of the scallop's tentacles and eyes. This nerve ring is so well developed that in some species it may be legitimately considered an additional ganglion. The visceral ganglia are also the origin of the branchial nerves which control the scallop's gills. The cerebral ganglia are the next largest set of ganglia, and lie distinct from each other a significant distance dorsal to the visceral ganglia. They are attached to the visceral ganglia by long cerebral-visceral connectives, and to each other via a cerebral commissure that extends in an arch dorsally around the esophagus. The cerebral ganglia control the scallop's mouth via the palp nerves, and also connect to statocysts which help the animal sense its position in the surrounding environment. They are connected to the pedal ganglia by short cerebral-pedal connectives. The pedal ganglia, though not fused, are situated very close to each other near the midline. From the pedal ganglia the scallop puts out pedal nerves which control movement of and sensation in its small muscular foot.

Reproduction

The scallop family is unusual in that some members of the family are dioecious (males and females are separate), while other are simultaneous hermaphrodites (both sexes in the same individual), and a few are protoandrous hermaphrodites (males when young then switching to female). Red roe is that of a female, and white, that of a male. Spermatozoa and ova are released freely into the water during mating season, and fertilized ova sink to the bottom. After several weeks, the immature scallops hatch and the larvae, miniature transparent versions of the adults called spat, drift in the plankton until settling to the bottom again (an event called spatfall) to grow, usually attaching by means of byssal threads. Some scallops, such as the Atlantic bay scallop Argopecten irradians, are short-lived, while others can live 20 years or more. Age can often be inferred from annuli, the concentric rings of their shells.

Locomotion

Overhead view of a scallop engaged in a zig-zag swimming motion

Overhead view of a scallop engaged in a unidirectional jumping motion

Scallops are mostly free-living and active, unlike the vast majority of bivalves, which are mostly slow-moving and infaunal. It is believed that all scallops start out with a byssus, which attaches them to some form of substrate such as eelgrass when they are very young. Most species lose the byssus as they grow larger. A very few species go on to cement themselves to a hard substrate (e.g. Chlamys distorta and Hinnites multirigosus).

However, the majority of scallops are free-living and can swim with brief bursts of speed to escape predators (mostly starfish) by rapidly opening and closing their valves. Indeed, everything about their characteristic shell shape— its symmetry, narrowness, smooth and/ or grooved surface, small flexible hinge, powerful adductor muscle, and continuous and uniformly curved edge— facilitates such activity. They often do this in spurts of several seconds before closing the shell entirely and sinking back to the bottom of their environment. Scallops are able to move through the water column either forward/ ventrally (termed swimming) by sucking water in through the space between their valves, an area called the gape, and ejecting it through small holes near the hinge line called exhalant apertures, or backward/ dorsally (termed jumping) by ejecting the water out the same way it came in (i.e., ventrally). A jumping scallop will usually land on the sea floor between each contraction of its valves, whereas a swimming scallop will stay in the water column for most or all of its contractions and will travel a much greater distance (though seldom at a height of more than one meter off the sea bed and seldom for a distance of greater than five meters). Both jumping and swimming movements are very energy-intensive and most scallops cannot perform more than four or five in a row before becoming completely exhausted and requiring several hours of rest. Should a swimming scallop land on its left side, it is capable of flipping itself over to its right side via a similar shell-clapping movement called the righting reflex. So-called singing scallops can make an audible, soft popping sound as they flap their shells underwater. Other scallops can extend their foot from between their valves, and by contracting the muscles in their foot, they can burrow into sand.

Distribution and habitat

Scallops inhabit all the oceans of the world, with the largest number of species living in the Indo-Pacific region. Most species live in relatively shallow waters from the low tide line to 100 meters, while others prefer much deeper water. Although some species only live in very narrow environments, most are opportunistic and can live under a wide variety of conditions. Scallops can be found living within, upon, or under either rocks, coral, rubble, sea grass, kelp, sand, or mud. Most adult specimens are either byssally attached or cemented to a substrate, while others are free swimmers.

Motility and behavior

Most species of the scallop family are free-living active swimmers, propelling themselves through the water through the use of the adductor muscles to open and close their shells. Swimming occurs by the clapping of valves for water intake. Closing the valves propels water with strong force near the hinge via the velum, a curtain-like fold of the mantle that directs water expulsion around the hinge. Scallops swim in the direction of the valve opening, unless the velum directs an abrupt change in course direction.

Other species of scallops can be found on the ocean floor attached to objects by byssal threads. Byssal threads are strong, silky fibers extending from the muscular foot, used to attach to a firm support, such as a rock. Some can also be found on the ocean floor, moving with the use of an extendable foot located between their valves or burrowing themselves in the sand by extending and retracting their feet.

Scallops are highly sensitive to shadows, vibrations, water movement, and chemical stimuli. All possess a series of 100 blue eyes, embedded on the edge of the mantle of their upper and lower valves that can distinguish between light and darkness. They serve as a vital defense mechanism for avoiding predators. Though rather weak, their series of eyes can detect surrounding movement and alert precaution in the presence of predators, most commonly sea stars, crabs, and snails.

Physiological fitness and exercise of scallops decreases with age due to the decline of cellular and especially mitochondrial function, thus increasing the risk of capture and lowering rates of survival. Older individuals show lower mitochondrial volume density and aerobic capacity, as well as decreased anaerobic capacity construed from the amount of glycogen stored in muscle tissue. Environmental factors, such as changes in oxidative stress parameters, can inhibit the growth and development of scallops.

Seasonal changes in temperature and food availability have shown to affect muscle metabolic capabilities. The properties of mitochondria from the phasic adductor muscle of Euvola ziczac varied significantly during their annual reproductive cycle. Summer scallops in May have lower maximal oxidative capacities and substrate oxidation than any other times in the year. This phenomenon is due to lower protein levels in adductor muscles.

Mutualism

Some scallops, including Chlamys hastata, frequently carry epibionts such as sponges and barnacles on their shell. The relationship of the sponge to the scallop is characterized as a form of mutualism, because the sponge provides protection by interfering with adhesion of predatory sea-star tube feet, camouflages Chlamys hastata from predators, or forms a physical barrier around byssal openings to prevent sea stars from inserting their digestive membranes. Sponge encrustation protects C. hastata from barnacle larvae settlement, serving as a protection from epibionts that increase susceptibility to predators. Thus, barnacle larvae settlement will occur more frequently on sponge-free shells than sponge-encrusted shells.

In fact, barnacle encrustation negatively influences swimming in C. hastata. Those swimming with barnacle encrustation require more energy and show a detectable difference in anaerobic energy expenditure than those without encrustation. In the absence of barnacle encrustation, individual scallops swim significantly longer, travel further, and attain greater elevation.

Lifecycle and growth

Many scallops are hermaphrodites (having female and male organs simultaneously), altering their sex throughout their lives, while others exist as dioecious species, having a definite sex. In this case, males are distinguished by roe containing white testes and females with roe containing orange ovaries. At the age of two, they usually become sexually active, but do not contribute significantly to egg production until the age of four. The process of reproduction takes place externally through spawning, in which eggs and sperm are released into the water. Spawning typically occurs in late summer and early autumn; spring spawning may also take place in the Mid-Atlantic Bight. The females of scallops are highly fecund, capable of producing hundreds of millions of eggs per year.

Once an egg is fertilized, it is then planktonic, which is a collection of microorganisms that drift abundantly in fresh or salt water. Larvae stay in the water column for the next four to seven weeks before dissipating to the ocean floor, where they attach themselves to objects through byssus threads. Byssus is eventually lost with adulthood, transitioning almost all scallop species into free swimmers. There is rapid growth within the first several years, with an increase of 50 to 80% in shell height and quadrupled size in meat weight and reach commercial size at about four to five years of age. The lifespans of some scallops have been known to extend over 20 years.

Fossil record

Fossil scallop Chlamys with encrusters; Nicosia Formation (Pliocene) of Cyprus.

The fossil history of scallops is rich in species and specimens. The earliest known records of true scallops (those with a ctenolium) can be found from the Triassic period, over 200 million years ago. The earliest species were divided into two groups, one with a nearly smooth exterior: Pleuronectis von Schlotheim, 1820, while the other had radial ribs or riblets and auricles: Praechlamys Allasinaz, 1972. Fossil records also indicate that the abundance of species within the Pectinidae has varied greatly over time; Pectinidae was the most diverse bivalve family in the Mesozoic era, but the group almost disappeared completely by the end of the Cretaceous period. The survivors speciated rapidly during the Tertiary period. Nearly 7,000 species and subspecies names have been introduced for both fossil and recent Pectinidae.

Taxonomy and list of genera

Scallops are a family Pectinidae of marine bivalve mollusks from the superfamily Pectinoidea (other families within the same superfamily, Pectinoidea, share a somewhat similar overall shell shape, and species within some of those families are also sometimes referred to as scallops).

The word Pectinidae comes from the Latin pecten meaning comb in reference to that structure near the animal's hinge.

More than 30 genera and around 350 species are in the family Pectinidae. Raines and Poppe list nearly 900 species names, but most of these are considered either questionable or invalid. They mention over 50 genera and around 250 species and subspecies. While species are generally well circumscribed, their attribution to subfamilies and genera is sometimes equivocal, and information about phylogeny and relationships of the species is minimal, not the least because most work has been based on adult morphology.

Evolution

The family Pectinidae is the most diversified of the pectinoideans in present-day oceans. It is one of the largest marine bivalve families and contains 300 extant species in 60 genera. Its origin dates back to the Middle Triassic Period, approximately 240 million years ago, and has been a thriving family to present day. Evolution from its origin has resulted in a successful and diverse group: pectinids are present in the world’s seas, found in environments ranging from the intertidal zone to the hadal depths. The Pectinidae play an extremely important role in many benthic communities and exhibit a wide range of shell shape, sizes, sculpture, and culture.

The earliest and most comprehensive taxonomic handlings of the family are based on macroscopic morphological characters of the adult shells and represent broadly divergent classification schemes. Some level of taxonomic stability was achieved when Waller’s studies in 1986, 1991, and 1993 concluded evolutionary relationships between pectinid taxa based on hypothesized morphological synapomorphies, which previous classification systems of Pectinidae failed to do. He created three Pectinidae subfamilies: Camptonectinidae, Chlamydinae and Pectininae.

The framework of its phylogeny shows that repeated life habit states derive from evolutionary convergence and parallelism. Studies have determined the Pectinidae family is monophyletic, developing from a single common ancestor. The direct ancestors of Pectinidae were scallop-like bivalves of the family Entoliidae. Entoliids had auricles and byssal notch only at youth, but they did not have a ctenolium, a comb-like arrangement along the margins of the byssal notch in Pectinidae. The ctenolium is the defining feature of the modern family Pectinidae and is a characteristic that has evolved within the lineage.

Recently, Puslednik et al. identified considerable convergence of shell morphology in a subset species of gliding Pectinidae, which suggests iterative morphological evolution may be more prevalent in the family than previously believed.

There have been a number of efforts to address phylogenetic studies. Only three have assessed more than 10 species and only one has included multiple outgroups. Nearly all previous molecular analyses of the Pectinidae have only utilized mitochondrial data. Phylogenies based only on mitochondrial sequence data do not always provide an accurate estimation on the species tree. Complicated factors can arise due to the presence of genetic polymorphisms in ancestral species and resultant lineage sorting.

In molecular phylogenies of the Bivalvia, both the Spondylidae and the Propeamussiidae have been resolved as sister to the Pectinidae. A useful strategy would be to include outgroup species from two or more closely related families.

Genera

Family Pectinidae

• Subfamily Camptonectinae Habe, 1977
  • Delectopecten Stewart, 1920
  • Ciclopecten Seguenza, 1877
  • Lyropecten Conrad, 1862
  • Pseudohinnites Dijkstra, 1989
• Subfamily Hemipectinae Habe, 1977 (disputed, often in Chlamydinae: Chlamydini)
  • Hemipecten Adams & Reeve, 1849
• Subfamily Palliolinae Korbkov in Eberzin, 1960
  • Tribe Palliolini Waller, 1993
    • Palliolum Monterosato, 1884
    • Lissochlamys Sacco, 1897
    • Placopecten Verrill, 1897
    • Pseudamussium Mörch, 1853
    • Mesopeplum Iredale, 1929
• Subfamily Pectininae
  • Tribe Decatopectinini Waller, 1986
    • Anguipecten Dall, Bartsch & Rehder, 1938
    • Annachlamys Iredale, 1939
    • Bractechlamys Iredale, 1939
    • Decatopecten Rüppell in G. B. Sowerby II, 1839
    • Excellichlamys Iredale, 1939
    • Flexopecten Sacco, 1897
    • Glorichlamys Dijkstra, 1991
    • Gloripallium Iredale, 1939
    • Juxtamusium Iredale, 1939
    • Mirapecten Dall, Bartsch & Rehder, 1938
  • Tribe Pectinini Wilkes, 1810

Pecten tigris Lamarck, 1819, museum specimens

• • • Dentamussium Dijkstra, 1990
    • Pecten Müller, 1776 (includes the Great or King scallop, Pecten maximus, Japanese (sea) scallop, Pecten yessoensis, the New Zealand scallop, Pecten novaezealandiae, and the Ravenel or Round-rib scallop, Pecten raveneli)
    • Euvola Dall, 1898 (includes the Zigzag scallop, Euvola ziczac)
    • Minnivola Iredale, 1939
    • Serratovola Habe, 1951
• Subfamily Chlamydinae von Teppner, 1922
  • Tribe Clamydini von Teppner, 1922
    

    Semipallium fulvicostatum
    • Chlamys Röding, 1798
    • Complichlamys Iredale, 1939
    • Coralichlamys Iredale, 1939
    • Equichlamys Iredale, 1929
    • Hinnites Deference, 1821
    • Laevichlamys Waller, 1993
    • Manupecten Monterosato, 1872
    • Nodipecten Dall, 1898
    • Notochlamys Cotton, 1930
    • Pascahinnites Dijkstra & Raines, 1999
    • Pedum Bruguière, 1791
    • Psychrochlamys Jonkers, 2003
    • Scaeochlamys Iredale, 1929
    • Semipallium Jousseaume in Lamy, 1928
    • Swiftopecten Hertlein, 1936
    • Veprichlamys Iredale, 1929
  • Tribe Austrochlamydini Jonkers, 2003
    • Austrochlamys Jonkers, 2003
  • Tribe Adamussiini Habe, 1977
    • Adamussium Thiele, 1934
  • Tribe Fortipectinini Masuda, 1963
    • Mizuhopecten Masuda, 1963
    • Patinopecten Dall, 1898
  • Tribe Crassadomini Waller, 1993
    • Crassadoma Bernard, 1986
    • Caribachlamys Waller, 1993
  • Tribe Mimachlamydini Waller, 1993
    • Mimachlamys Iredale, 1929
    • Spathochlamys Waller, 1993
    • Talochlamys Iredale, 1935 includes Talochlamys pusio (Linnaeus, 1758) == Chlamys distorta (da Costa, 1778)
  • Tribe Aequipectinini F. Nordsieck, 1969
    • Aequipecten Fischer, 1886 (includes Rough scallop Aequipecten muscosus)
    • Argopecten Monterosato, 1889 (includes bay scallop, Argopecten irradians, Atlantic calico scallop Argopecten gibbus and Pacific calico scallop, Argopecten ventricosus)
    • Cryptopecten Dall, Bartsch & Rehder, 1938
    • Haumea Dall, Bartsch & Rehder, 1938
    • Leptopecten Verrill, 1897
      • Leptopecten latiauratus Conrad, 1837
    • Volachlamys Iredale, 1939
• Subfamily incertae sedis
  • Hyalopecten Verrill, 1897

Seafood industry

Wild fisheries

By far the largest wild scallop fishery is for the Atlantic sea scallop (Placopecten magellanicus) found off northeastern United States and eastern Canada. Most of the rest of the world's production of scallops is from Japan (wild, enhanced, and aquaculture), and China (mostly cultured Atlantic bay scallops).

Scallops are most commonly harvested using scallop dredges or bottom trawls. Recently, scallops harvested by divers, hand-caught on the ocean floor, have entered the marketplace. In contrast to scallops captured by a dredge across the sea floor, diver scallops tend to be less gritty. They are also more ecologically friendly, as the harvesting method does not cause damage to undersea flora or fauna. In addition, dredge-harvesting methods often result in delays of up to two weeks before the scallops arrive at market, which can cause the flesh to break down, and results in a much shorter shelf life.

Aquaculture

Main article: Scallop aquaculture

In 2005, China accounted for 80% of the global scallop and pecten catch, according to an FAO study. Outside of China, Russia remained the industry leader.

Sustainability

New Zealand

The Tasman Bay area was closed to commercial scallop harvesting from 2009 to 2011 due to a decline in the numbers. In 2011, industry-funded research was conducted into scallop-harvesting patterns. Forest and Bird list scallops as "Worst Choice" in their Best Fish Guide for sustainable seafood species.

United States

On the east coast of the United States, over the last 100 years, the populations of bay scallops have greatly diminished due to several factors, but probably is mostly due to reduction in sea grasses (to which bay scallop spat attach) caused by increased coastal development and concomitant nutrient runoff. Another possible factor is reduction of sharks from overfishing. A variety of sharks used to feed on rays, which are a main predator of bay scallops. With the shark population reduced — in some places almost eliminated — the rays have been free to feed on scallops to the point of greatly decreasing their numbers. By contrast, the Atlantic sea scallop (Placopecten magellanicus) is at historically high levels of abundance after recovery from overfishing.

As food

Scallops with wine sauce

Scallops are characterized by having two types of meat in one shell: the adductor muscle, called "scallop", which is white and meaty, and the roe, called "coral", which is red or white and soft. Sometimes, markets sell scallops already prepared in the shell, with only the adductor muscle intact. Outside the U.S., the scallop is often sold whole. In the UK and Australia, they are available both with and without the roe. The roe is also usually eaten.

Scallops without any additives are called "dry packed", while scallops that are treated with sodium tripolyphosphate (STPP) are called "wet packed". STPP causes the scallops to absorb moisture prior to the freezing process, thereby increasing the weight. The freezing process takes about two days.

In Galician cuisine, scallops are baked with bread crumbs, ham, and onions. In Japanese cuisine, scallops may be served in soup or prepared as sashimi or sushi. In a sushi bar, hotategai (帆立貝, 海扇) is the traditional scallop on rice, and while kaibashira (貝柱) may be called scallops, it is actually the adductor muscle of any kind of shellfish, e.g., mussels, oysters, or clams. Dried scallop is known in Cantonese Chinese cuisine as conpoy (乾瑤柱, 乾貝, 干貝). Smoked scallops are sometimes served as appetizers or as an ingredient in the preparation of various dishes and appetizers.

Scallops have lent their name to the culinary term "scalloped", which originally referred to seafood creamed and served hot in the shell. Today, it means a creamed casserole dish such as scalloped potatoes, which contains no seafood at all. In Australia and New Zealand, potato scallop often refers to a deep fried battered potato slice sold at fish and chip shops.

• 

  Adductor muscle meat of the giant scallop (seven white circular items) with a large shrimp

• 

  Dried scallops, also known as conpoy

• 

  Taiwanese steamed scallops

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  A scallop being grilled next to sausages in Japan

• 

  Fried scallops on stick served with rice

Symbolism of the shell

Portrait by Carlo Crivelli, c. 1480

Christianity

See also: Pecten jacobaeus

Shell of Saint James

The scallop shell is the traditional emblem of James, son of Zebedee, and is popular with pilgrims on the Way of St James to the apostle's shrine at Santiago de Compostela in Galicia (Spain). Medieval Christians making the pilgrimage to his shrine often wore a scallop shell symbol on their hat or clothes. The pilgrim also carried a scallop shell with him, and would present himself at churches, castles, abbeys etc., where he could expect to be given as much sustenance as he could pick up with one scoop. Probably he would be given oats, barley, and perhaps beer or wine. Thus even the poorest household could give charity without being overburdened.

The association of Saint James with the scallop can most likely be traced to the legend that the apostle once rescued a knight covered in scallops. An alternative version of the legend holds that while St. James' remains were being transported to Galicia (Spain) from Jerusalem, the horse of a knight fell into the water, and emerged covered in the shells.

Indeed, in French the animal (as well as a popular preparation of it in cream sauce) is called coquille St. Jacques. In German, they are Jakobsmuscheln — literally "James mussels". Curiously the Linnaeus name Pecten jacobeus refers to the Mediterranean scallop, while the scallop endemic to Galicia is called Pecten maximus due to its bigger size. Moreover, though the shell is sometimes referred to as "Saint James' cockle", it is not a cockle at all.

The scallop shell is represented in the decoration of churches named after St. James, such as in St James' Church, Sydney, where it appears in a number of places, including in the mosaics on the floor of the chancel.

When referring to St James, a scallop shell valve is displayed with its convex or outer surface showing. In contrast, when a scallop valve refers to the goddess Venus (see below) the scallop valve is displayed with its concave interior surface showing.

Aphrodite in a sea shell, from Amisos, now in the Louvre

A scallop shell as a heraldic device on a German coat of arms

Large sculpture of a scallop on the beach at Aldeburgh, England

Shell of Saint Augustine

Saint Augustine is said to have been walking along the seashore, meditating on the unfathomable mystery of the Holy Trinity. A boy was using a shell to pour sea water into a little hole. When Augustine asked him what he was doing, he replied, "I am emptying the sea into this hole." Thus did Augustine understand that man would never penetrate to the depths of the mystery of God.

This symbolic meaning was taken up by Joseph Ratzinger in his coat of arms as Archbishop of Munich, and also retained by him when elected Pope Benedict XVI. While a doctoral candidate in 1953, Ratzinger wrote his dissertation on The People of God and the House of God in Augustine's Teaching, and the shell therefore has a personal connection with the thought of Saint Augustine.

Heraldry

The scallop shell symbol found its way into heraldry as a badge of those who had been on the pilgrimage to Compostela, although later it became a symbol of pilgrimage in general. Winston Churchill and Diana, Princess of Wales' family, the Spencer family coat of arms includes a scallop, as well as both of Diana's sons Prince William, Duke of Cambridge and Prince Harry's personal coats of arms; also Pope Benedict XVI's personal coat of arms includes a scallop; another example is the surname Wilmot and also John Wesley's (which as a result the scallop shell is used as an emblem of Methodism). However, charges in heraldry do not always have an unvarying symbolic meaning, and there are cases of arms in which no family member went on a pilgrimage and the occurrence of the scallop is simply a pun on the name of the armiger (as in the case of Jacques Coeur), or for other reasons.

Fertility symbol

Throughout antiquity, scallops and other hinged shells have symbolized the feminine principle. Outwardly, the shell can symbolize the protective and nurturing principle, and inwardly, the "life-force slumbering within the Earth", an emblem of the vulva.

Many paintings of Venus, the Roman goddess of love and fertility, included a scallop shell in the painting to identify her. This is evident in Botticelli's classically inspired The Birth of Venus (jocularly nicknamed 'Venus on the half-shell').

One legend of the Way of St. James holds that the route was seen as a sort of fertility pilgrimage, undertaken when a young couple desired to bear offspring. The scallop shell is believed to have originally been carried, therefore, by pagans as a symbol of fertility.

Alternatively, the scallop resembles the setting sun, which was the focus of the pre-Christian Celtic rituals of the area. To wit, the pre-Christian roots of the Way of St. James was a Celtic death journey westwards towards the setting sun, terminating at the End of the World (Finisterra) on the "Coast of Death" (Costa da Morte) and the "Sea of Darkness" (i.e., the Abyss of Death, the Mare Tenebrosum, Latin for the Atlantic Ocean, itself named after the Dying Civilization of Atlantis). The reference to St. James rescuing a "knight covered in scallops" is therefore a reference to St. James healing, or resurrecting, a dying (setting sun) knight. Similarly, the notion of the "Sea of Darkness" (Atlantic Ocean) disgorging St. James' body, so that his relics are (allegedly) buried at Santiago de Compostella on the coast, is itself a metaphor for "rising up out of Death", that is, resurrection.

Other uses

In 1988, the State of New York in the US chose the bay scallop (Argopecten irradians) as its state shell.

In design, 'scalloped edges' or 'scalloped ridges' refers to a wavy pattern reminiscent of the edge or surface of a typical scallop shell. The background relief of the famous Meissen porcelain Swan Service is based on the ridges of scallop shells. Since 1904, the energy corporation Royal Dutch Shell has derived its highly recognizable logo from the scallop species Pecten maximus in a series of increasingly stylised representations. On the beach at Aldeburgh, Suffolk, England, is Maggi Hambling's metal sculpture, The Scallop, erected in 2003 as a memorial to the composer Benjamin Britten, who had a long association with the town.

Gallery

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  The great scallop, Pecten maximus, on the right, next to the native European oyster Ostrea edulis

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  A shell of a Pecten species with serpulid worm encrustation; Duck Harbor Beach on Cape Cod Bay, Wellfleet, Massachusetts

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  External mold of a scallop shell in the fossil genus Aviculopecten, from the Logan Formation, Lower Carboniferous, Ohio

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  Pedum spondyloideum from the North coast of East Timor

Further references

• Rombauer, Irma S. and Marion Rombauer Becker (1931 [1964]) The Joy of Cooking, p 369. Indianapolis: Bobbs-Merrill. ISBN 0-452-25665-8.

External links

• Rotterdam Natural History Museum Natural History Museum Rotterdam – photos of Pectinidae shells
• Alaska Department of Fish and Game – scallop page
• NOAA Fisheries: Northeast Fisheries Science Center – Research on Bay Scallop Aquaculture and Enhancement
• Delaware Sea Grant, University of Delaware – scallop page
• Classification of Pectinoidea (Propeamussiidae and Pectinidae) – includes partly different genera, with subfamilies and tribes.
• "Too Few Jaws: Shark declines let rays overgraze scallops", Science News, March 31, 2007