Placopecten magellanicus

Neural map

The shell has a classic form, with smooth shell and edges, unlike Pecten maximus (common name the "great scallop" or "king scallop") which has flutes and scalloped edges; size is around 80 millimetres (3+1⁄4 in), with individuals up to 170 millimetres (6+3⁄4 in) in diameter. The shell is generally pinkish-red in color, with striped variegation to darker shades appearing in many individuals. The adductor muscle itself is large, often 30–40 millimetres (1+1⁄4–1+1⁄2 in) in diameter. Like all scallops, P. magellanicus has photoreceptive eyes along the edge of the pinkish mantle.^[5]

Placopecten magellanicus is found on the continental shelf of the northwest Atlantic from the north shore of the Gulf of St. Lawrence south to Cape Hatteras, North Carolina.^[6]

Sea scallops typically occur at depths ranging from 18–110 m, but may also occur in waters as shallow as 2 m in estuaries and embayments along the Maine coast and in Canada. In southern areas, scallops are primarily found at depths between 45 and 75 m, and are less common in shallower water (25–45 m) due to high temperature. Although sea scallops are not common at depths greater than about 110 m, some populations have been found as deep as 384 m, and deep-water populations at 170–180 m have been reported in the Gulf of Maine. Sea scallops often occur in aggregations called beds. Beds may be sporadic (perhaps lasting for a few years) or essentially permanent (e.g., commercial beds supporting the Georges Bank fishery). The highest concentration of many permanent beds appears to correspond to areas of suitable temperatures, food availability, substrate, and where physical oceanographic features such as fronts and gyres may keep larval stages in the vicinity of the spawning population.^[6]

Adult sea scallops are generally found on firm sand, gravel, shells, and rock. Other invertebrates associated with scallop beds include sponges, hydroids, anemones, bryozoans, polychaetes, mussels, moon snails, whelks, amphipods, crabs, lobsters, sea stars, sea cucumbers, and tunicates.^[6]

Discover more about Range and habitat related topics

Gulf of St. Lawrence

Gulf of St. Lawrence

The Gulf of St. Lawrence is the outlet of the North American Great Lakes via the St. Lawrence River into the Atlantic Ocean. The gulf is a semi-enclosed sea, covering an area of about 226,000 square kilometres (87,000 sq mi) and containing about 34,500 cubic kilometres (8,300 cu mi) of water, at an average depth of 152 metres (500 ft).

Cape Hatteras

Cape Hatteras

Cape Hatteras is a cape located at a pronounced bend in Hatteras Island, one of the barrier islands of North Carolina.

Gulf of Maine

Gulf of Maine

The Gulf of Maine is a large gulf of the Atlantic Ocean on the east coast of North America. It is bounded by Cape Cod at the eastern tip of Massachusetts in the southwest and by Cape Sable Island at the southern tip of Nova Scotia in the northeast. The gulf includes the entire coastlines of the U.S. states of New Hampshire and Maine, as well as Massachusetts north of Cape Cod, and the southern and western coastlines of the Canadian provinces of New Brunswick and Nova Scotia, respectively.

Georges Bank

Georges Bank

Georges Bank is a large elevated area of the sea floor between Cape Cod, Massachusetts, and Cape Sable Island, Nova Scotia (Canada). It separates the Gulf of Maine from the Atlantic Ocean.

Sea anemone

Sea anemone

Sea anemones are a group of predatory marine invertebrates of the order Actiniaria. Because of their colourful appearance, they are named after the Anemone, a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia. As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and Hydra. Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle.

Whelk

Whelk

Whelks are any of several carnivorous sea snail species with a swirling, tapered shell. Many are eaten by humans, such as the common whelk of the North Atlantic. Most whelks belong to the family Buccinidae and are known as "true whelks." Others, such as the dog whelk, belong to several sea snail families that are not closely related.

According to NOAA, the Atlantic sea scallop fishery is healthy, and is harvested at sustainable levels.^[7] The federal fishery is managed by NOAA Fisheries and the New England Fishery Management Council. The U.S. Atlantic sea scallop fishery is the largest wild scallop fishery in the world.^[8] In 2008, 53.5 million pounds of sea scallop meats worth $370 million were harvested in the United States, with Massachusetts and New Jersey responsible for the majority.^[9] In 2018, 58.2 million pounds of sea scallop meats worth $532.9 million were harvested in the United States with Massachusetts responsible for the majority.^[10]

Between the 1960s and the mid-1990s, the U.S. federal Atlantic sea scallop fishery declined steadily. In 1994 a new set of management guidelines were implemented including a moratorium on permits, limited days at sea, gear and crew restrictions, and areas closed to fishing. Between 1994 and 2005, the biomass of the U.S. sea scallop population increased by 18-fold on Georges Bank and by 8-fold in the Mid-Atlantic Bight region.^[11]

The state of Maine has an inshore (within 3 miles) winter (December - April) scallop fishery that is managed by the Maine Department of Marine Resources.^[12] Scallops in Maine inshore waters are harvested by mechanical draggers or by SCUBA divers ("dive caught"). In 2009 low harvest numbers caused the Department of Marine Resources to cut the season short and proposed a series of management measures.^[13][14] Entry to the fishery became limited, the season was reduced to 70 days, and the minimum ring size was increased to four inches. Additionally, 13 conservation closures (~20% of coastal Maine waters) were created for the following three fishing seasons.^[15] In 2012, the Department of Marine Resources proposed developing a rotational closure system for the fishery, based on a 10-year schedule.^[16] This rotational closure system was adopted only in the Zone 2 region of the state fishery. All three zones have different management tools that include limited access areas and in-season targeted closures.^[17] Since 2009, both dollar value and landings have gone up for the sea scallop fishery in the state of Maine.^[18]

The Monterey Bay Aquarium Seafood Watch lists sea scallops as a "Good Alternative," its second best rating.^[19] Greenpeace red listed the Atlantic sea scallop, stating that scallop stocks are being overfished and that the fishing methods used are destroying corals and sponges. According to Greenpeace the fishery of scallops kills nearly 1,000 loggerhead sea turtles every year.^[20] Since 2015, chain mats and Turtle Deflector Dredges (TDDs) have been added to offshore equipment to reduce sea turtle deaths.^[21] This has caused a significant reduction in sea turtles getting caught in harvesting gear.