Identification of live scallops and dead scallops 1. Color: Generally speaking, live scallops are more shiny in color, while dead scallops generally have no luster and look obviously stale. 2. Smell: Usually, live scallops are relatively fresh and do not smell fishy, ??while dead scallops usually smell an obvious fishy smell and have poor freshness.

Scallop is the name for the bivalve mollusk of the genus Scallopus, with about 400 species. More than 60 species of this family are one of the important marine fishery resources around the world. The shell, meat and nacre have extremely high utilization value. Many scallops are eaten as a delicacy.

Common scallops

1. Bay scallops

Bay scallops are native to the shallow seas on the Atlantic coast of the United States or in the mud and sand substrate of inner bays. Their survival water temperature is 2-34℃, growth water temperature is 5-30℃. Under the condition of -1°C, the survival rate after 72 hours was 75. The shells closed and no byssus was secreted below 3°C. The growth stopped below 5°C. It grew well above 10°C and grew fastest at 18-28°C. Bay scallops have strong adaptability to changes in salinity. The suitable salt range for the growth of juvenile 1mm scallops is 21‰-37‰, the optimal salt range is 25‰-34‰, and the suitable salt range for adult scallops is 16‰-43‰. , the suitable salinity for growth is 2l‰-35‰.

2. Ezo scallop

Ezo scallop is a narrow-temperature cold-water shellfish. Its suitable growth temperature range is 5-20℃, and the optimal growth water temperature is 10-20℃. Growth is slow when the temperature is below 5°C, and movement is extremely reduced until it stagnates at 0°C. When the water temperature is higher than 23°C, the living ability is weakened, and the plant gradually dies. The adaptability range of Ezo scallops to salinity is narrow, with a suitable salinity of 25‰-35‰ and an optimal salinity of 30‰-33‰. However, the suitable salinity range of juvenile scallops is wider, with a salinity as low as 11.5‰. In salty seawater and high-salt seawater with a salinity of 40.7‰, the gill cilia movement is still normal.

Ezo scallops have poor resistance to dryness. Shell seedlings with a shell height of 1.8-2cm will all die if the temperature is 28°C and exposed to the air for 16 hours; if the temperature is 27°C, they will all die if they are exposed to the air for 2 days; if the temperature is 26°C, they will all die if they are exposed to the air for 5 days.

3. Zhikong scallop

Zhikong scallop is naturally distributed along the Bohai Sea and the northern coast of the Yellow Sea. It lives in areas with rapid currents, high salinity, high transparency, and water depths of 10- It lives on the 30m reef bottom or the hard bottom with shells and gravels, clinging to it with byssus. Chlamydia scallops have strong adaptability to low temperatures. It grows well when the water temperature is 15-25℃, and can survive when the water temperature is -1.5℃ and a thin layer of ice forms on the water surface. However, the shells can hardly grow below 4℃, and the growth is also affected when the water temperature is above 25℃. Below 2℃ or above 30℃ can cause death. The adaptive range of Chlamydomonas scallops to the specific gravity of seawater is 1.015-1.029, and 1.017-1.026 is the most suitable.