Out-of-season portunus trituberculatus larva breeding method

Abstract

The invention discloses an out-of-season portunus trituberculatus larva breeding method. The method comprises three steps of selection of parents, hatching of ovigerous crabs and larva breeding. The method has the advantages that the artificially bred parents are selected to achieve full-artificial breeding, the industry problem of relying on sea fishing for breeding wild ovigerous crabs is eliminated, and large-scale larva breeding is facilitated; mid-September is selected as the time for hatching the ovigerous crabs, which avoids the precocity of crab larvae in the current year and also ensures larger specification when the products appear on the market in June-July of the next year; according to the developmental stage of the crab larvae, different anti-disability opacifying agents areselected, reduce the cannibalism of the crab larvae, make the crab larvae develop simultaneously and rapidly, also have a function of regulating the water quality, and greatly increase the survival rate; specially, water is changed by adopting a crab larva taking-out mode, the workload is not increased, but an artificial selection effect on the crab larvae during crab larva taking-out is achieved,and sick and weak crab larvae with poor vigour can be eliminated, thereby improving the whole quality of the crab larvae.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to an off-season breeding method for portunus crabs. Background technique [0002] Portunus trituberculatus is one of the important species of aquaculture in China. It has delicious meat, rich nutrition and high economic value, and enjoys a high reputation at home and abroad. In recent years, with the breakthrough of artificial breeding technology, the pond aquaculture industry has developed rapidly. In 2014, the national aquaculture area reached 500,000 mu, with an output of 119,000 tons. At present, there are two main breeding methods for portunus trituberculatus: one is to raise seedlings from the end of April to the beginning of May, to breed in the original pond, and to catch and market around the Spring Festival (January to March); the other is to buy them from the end of May to the beginning of June. Crab seedlings are cultivated until around the Spring Festival (January...

AI Technical Summary

Problems solved by technology

The second crop of this farming method is essentially off-season farming, and the quality of the finished crabs is worse than that of the first crop

Moreover, the policy stipulates that "every year from 12 o'clock on April 1st to 12 o'clock on September 16th, all fishing boats are prohibited from fishing swimming crabs, brood crabs and juvenile crabs, and those caught by accident must be released immediately." The number of brooding crabs is far from meeting the needs of the second batch of farming

[0005] In addition, patent document 2 (CN108094282A) provides a method for cultivating high-quality oviposit crabs of Portunus trituberculatus, which can be applied to patent document 1, but it only involves the cultivation of oviposit crabs, and there is no relevant content on seedling cultivation, which is not perfect , so its application is also limited

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