A method for ecological fattening and quality control of river crab cultured in ponds

Abstract

The invention discloses a method for ecologically fattening and regulating quality of pond breeding river crabs, which comprises steps: preparation of a fattening pond, selecting and stocking of crabs, salinity regulation of fattening water, daily management and fishing and marketing. The method for ecologically fattening and regulating quality of pond breeding river crabs artificially creates suitable salinity conditions and feeds high quality baits according to the influence of water salinity to gonad development and physiological metabolism of eriocheir sinensis, and improves fattening effect and quality of merchandise crabs. The method for ecologically fattening and regulating quality of pond breeding river crabs is characterized in that male and female crabs are separately fattened, suitable water salinity (male crabs are 10-15ppt, female crabs are 5-8ppt) is selected, fine sands are paved on the bottom of the fattening pond, oxygen is charged from micropores which are arranged on the bottom portion of the fattening pond, and the male and female crabs are scientifically feed. Gonadosomatic index of female crabs is increased to about 8% from initial about 4% through scientific fattening for 30-40 days, the gonadosomatic index of male crabs is increased to about 3% from initial about 1%, and the radios of survival rate of fattening and high quality green crab respectively achieve above 80% and 70%, thereby improving taste, nutritive value and economic value of river crabs. The method for ecologically fattening and regulating quality of pond breeding river crabs is suitable for river crab breeding enterprises, breeding farmers and marketing units, and is beneficial to improve breeding efficiency and nutritional quality of river crabs.

Description

technical field [0001] The invention relates to a method for ecological fattening and quality control of adult river crabs, belonging to the technical field of aquaculture. Background technique [0002] Chinese mitten crab, referred to as river crab (hereinafter referred to as river crab), is the most important cultured crab species in my country. In 2013, the national adult crab breeding output reached 729,900 tons, with an annual output value of more than 40 billion yuan. Since the gonads and hepatopancreas are important edible parts of Chinese mitten crabs, commercial crabs are mainly adult crabs with mature gonads or almost mature gonads, and the time for gonads to mature or nearly mature in Chinese mitten crabs is 10-12 months , Fishing too early or too late will affect its edible value. Therefore, its sales and consumption time are mainly concentrated from the end of October to the beginning of December. The concentrated sales time of Chinese mitten crab makes the com...

AI Technical Summary

Problems solved by technology

The concentrated sales time of Chinese mitten crab makes the commercial crab sales market excessively competitive and the price fluctuates greatly. The healthy development of the

[0003] At present, there are two key problems in the cultivation of river crabs in ponds in my country: 1. The marketing and sales of cultured river crabs are concentrated from the end of October to December. During this period, the competition in the sales market of river crabs is excessive, and the price fluctuates greatly, which leads to greater risks in breeding. It is not conducive to the healthy development of the industry; 2. Due to contact with pond bottom mud and fattening in fresh water, commercial river crabs in ponds usually have an earthy smell, and their nutritional components and sensory quality are not good. Their nutritional quality and economic value need to be further improved.

[0006] Although water salinity is an important environmental factor affecting gonad development and nutritional quality of river crabs, so far, the prior art has not disclosed a technical solution for ecological fattening and quality control of river crabs cultured in ponds through regulation of water salinity

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