Method of controlling big-standard female crab egg carrying amount of Chinese mitten crab

Abstract

The invention relates to a method of controlling a big-standard female crab egg carrying amount of a Chinese mitten crab. The method includes selecting parents according to a GB / T19783-2005 standard of the Chinese mitten crab in the first ten-day period of November, marking the parents, raising female crabs and male crabs separately and conducting strengthening cultivation; matching the parent crabs according to a requirement of breeding in the last ten-day period of November, for example, a parent crab male and female ratio of a full sibs family is one to one, and the parent crab male and female ratio of a half-sibs family is two or three to one, arranging one male crab into each group, putting one group of crabs into one specially-made mating cage; sinking the in-proportion assembled parent crab mating cage into an outdoor soil pool with temperature of six to eight DEG C, salinity of 20 per thousand and water depth of one meter, setting three methods including that the bottom of the mating cage does not contact the bottom of the soil pool and suspends in pool water, the bottom of the mating cage contacts the bottom of the soil pool and the bottom of the mating cage is inserted into the bottom of the pool by five centimeters, and conducting directional mating. Small, medium and big breeding requirements of big-standard female crab egg carrying amount are achieved.

Description

technical field [0001] The invention relates to a method for controlling the amount of eggs laid by large-scale Chinese mitten crabs (Eiocheir sinensis). Background technique [0002] Chinese mitten crab (Eiocheir sinensis), commonly known as river crab, is an important economic crustacean in my country. In my country, it is mainly naturally distributed in the three major water systems of the Yangtze River, Liao River, and Ou River. Among them, the river crabs in the Yangtze River system grow fast, have large individuals, and have strong disease resistance. According to statistics, in 2010, the national mitten crab breeding area was more than 14.5 million mu, the output was 582,500 tons, and the output value was 33.543 billion yuan. The Chinese mitten crab industry has become an important pillar industry of aquatic products. In recent years, due to the disordered introduction of Chinese mitten crabs from different water systems into the Yangtze River Basin, the germplasm of...

AI Technical Summary

Problems solved by technology

At present, group selection and family selection have been successfully applied to the genetic breeding of Chinese mitten crabs. However, when large-scale brood crabs are used for group selection and family selection, it is often encountered that the survival rate of large-scale oviposit crabs is low. question

Eriocheir sinensis female crab's egg load is proportional to its size, the huge egg load can easily cause the egg-bearing crab to die during the winter, thus affecting the smooth progress of breeding

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