Culturing method for blue crab egg-carrying crab phase

Abstract

A culturing method for a blue crab egg-carrying crab phase relates to the field of aquiculture. A blue crab egg-carrying crab is placed in a crab apartment and cultured, meaning each blue crab egg-carrying crab is bred in a culturing box; water in the culturing box is filtered, ultraviolet-disinfected and protein-separation processed; in high temperature seasons, a crab apartment system can be placed in an air conditioning room; the culturing water temperature is kept at 22 DEG C to 26 DEG C and salinity is kept at 26 to 30; the water can be circulated for 8 times for each day; water exchanging amount for each day can be 15% to 25% of original water amount according to a volume percentage; one to two astartes are fed to each blue crab egg-carrying crab; food residuals and feces are cleaned for one time each day; a blue crab egg-carrying crab embryonic development process is determined according to embryonic development accumulated temperature and embryo heartbeat times; and to-be-hatched blue crab egg-carrying crabs are moved to a hatching barrel. The culturing method is simple and easy to operate.

Description

Technical field [0001] The present invention relates to aquaculture, in particular to a method for cultivating scylla crabs at the stage of holding eggs. Background technique [0002] Scylla crab is the marine crab with the highest aquaculture production in my country. In recent years, the annual output has reached more than 120,000 tons, and it occupies an important position in marine aquaculture in the southeast coast of my country. [0003] The breeding method of blue crab is different from that of shrimp. Scylla crabs do not directly discharge their eggs into the body of water outside the body, but collect and adhere to the abdomen after the laid and fertilized eggs. Scylla crabs that carry fertilized eggs are called egg crabs (commonly known as flowering crabs). The period from the beginning of the fertilized egg to the hatching of the larva is the embryonic development period. The quality of embryos directly affects the survival of larvae, so obtaining high-quality egg-car...

AI Technical Summary

Problems solved by technology

In the high temperature season in summer, especially when the water temperature exceeds 28°C, there are two serious problems in the cultivation of oviposit crabs: 1) Poor embryo quality: the embryos of oviposit crabs develop faster at high temperatures, but the embryos of the same oviposit crab often develop out of sync , affecting the quality of embryos, the quality of larvae after hatching is very poor, and it does not have the value of artificial breeding

In the high temperature season, due to the large volume of the breeding pond, it is difficult to reduce the temperature of the pond water despite the use of running water and adding ice cubes, and the problem of asynchronous embryonic development cannot be overcome.

2) High mortality rate of egg-bearing crabs: egg-bearing crabs tend to die in large numbers in high temperature seasons

By improving the structure of the cultivation pool, the number of bacteria in the bottom substrate can be reduced, and the living environment of blue crabs can be improved, but the high mortality rate of oviposit crabs cannot be effectively reduced (Chinese patent: ZL200720068248.7)