Out-of-season male and female separate breeding method of portunus trituberculatus

Abstract

The invention discloses an out-of-season male and female separate breeding method of portunus trituberculatus. The method comprises three stages of hatching of ovigerous crabs, large-scale larval rearing and male and female separate breeding. The method has the advantages that male and female separate breeding is adopted, which weakens cannibalism caused by inconformity of the growth speed of maleand female crabs, thereby greatly increasing the breeding survival rate and increasing the yield; what's more, the out-of-season separately bred male crabs can appear on the market 15-30 days earlierthan the female crabs, which fills in early-stage gaps of the market, and within most time of the closed fishing season of the portunus trituberculatus from May to August, products can be provided for customers, thereby obtaining good social and economic benefits.

Description

Technical field [0001] The invention relates to the technical field of aquaculture, in particular to a method for the off-season male and female breeding of Portunus trituberculatus. Background technique [0002] Portunus trituberculatus is one of the important species of aquaculture in China. Its delicious meat, rich nutrition, and high economic value are well-known at home and abroad. With the breakthrough of artificial breeding technology in recent years, the pond aquaculture industry has developed rapidly. [0003] Patent Document 1 (CN107361001A) provides a method for breeding Portunus trituberculatus with two crops a year, which can provide adult crabs in the two periods of January to February and June to July, which can be used to fill the period from May to August. The supply of Portunus trituberculatus is blank to meet consumer demand. The first crop of this breeding method is female crabs, which are large individual finished cream crabs with high quality; the second cro...

AI Technical Summary

Problems solved by technology

The first batch of this breeding method is all female crabs, which are large finished crabs with high quality; the second batch is mixed male and female crabs, and the quality is relatively poor

[0004] Judging from the current breeding practice, there are some disadvantages in the mixed breeding of males and females in the second batch of breeding: (1) male crabs have a strong ability to grab food, and female crabs are difficult to grab bait, resulting in a smaller size of female crabs; (2) male and female crabs Individual molting is not synchronized, especially the last mature molting. Male crabs are usually about 15 to 30 days earlier than female crabs, so soft-shell crabs that are molting or just molting are easily killed, thereby reducing the survival rate; (3 ) Mixed breeding of male and female crabs makes it difficult to catch male crabs alone. Usually, they can only be marketed at the same time as female crabs, so it is difficult to sell at a good price

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