Effective measures to improve hatching rate of scallop culture

Scallop is a synonym for bivalve molluscs of the genus scallop, with more than 400 species. More than 60 species of this family are one of the most important marine fishery resources in the world. Shell, meat and pearl layer have high utilization value. Many scallops are eaten as delicacies. The bright and radiant scallops are loved by collectors, and the patterns are adopted as the patterns of works of art. Scallop is a family of pterygoid pearl shellfish of bivalve class. It is widely distributed in the sea areas of the world, and the tropical sea is the most abundant. About 45 species have been found in China, among which chlamys farreri in the north and chlamys farreri and chlamys farreri in the south are important economic species. Scallop, also known as sea fan, its meat is delicious, nutritious, its adductor muscle dried is "dried scallops", is listed as one of the eight treasures. How to improve the hatching rate of scallop culture bothers many aquaculturists, so we provide some information for farmers' reference.

I. selection of parent shellfish and overwintering

1. It is required to choose parent shellfish with full gonads, large individual and complete appearance. After entering the workshop, the pro-shellfish was stable for 2 days, the water temperature was natural water temperature (3 ℃), and the temporary culture density was 90 / cubic meter ~ 100 / cubic meter.

two。 It is recommended to use indoor overwintering, change the natural sea water of 1 beat 3 or 1 beat 2 every day, and absorb pollution once every 5 to 6 days.

Second, the temporary preservation and ripening of parent shellfish

The culture of parent shellfish is the foundation, and the mature degree of gonad development of parent shellfish directly affects the quality of egg acquisition.

1. Pay attention to the increase of effective temperature and control the speed of water temperature rise. The water temperature of parent shellfish increased by 1 ℃ per day in the early stage, stable for 3 days when it rose to 15 ℃, and then increased by 0.5 ℃ per day to 19 ℃ to wait for delivery.

two。 Pay attention to improving the content of ammonia nitrogen and dissolved oxygen in water. When the water temperature reaches 16 ℃, the method of long running water and often absorbing pollution should be adopted to improve the water quality, and the amount of water exchange reaches 1 full volume per day, and at the same time, the water quality should be improved by pouring the pond once a day and the water temperature reaches 16 ℃.

3. Pay attention to the nutritional collocation of bait to make the accumulation of hatching yellow reach a certain amount. The diet is mainly composed of fresh diatoms, supplemented by gold algae and alternative bait (such as starch, egg yolk, spirulina powder). In the early stage, the daily feeding amount was 50 000 cells / ml water ~ 200000 cells / ml water. After 14 ℃, the food intake increased, and the daily feeding amount was 200000 cells / ml water ~ 400000 cells / ml water, divided into 8 ~ 12 times.