Method for promoting portunus trituberculatus females to quickly develop roe

Abstract

The invention provides a method for promoting portunus trituberculatus females to quickly develop roe. The method comprises the following steps of: preparation of a roe-growing pond, selection and stocking of the females, breeding environment conditions, preparation of baits, daily management and catching and selling. According to the development law of the ovary of the portunus trituberculatus, good environment conditions are artificially created, and good-quality baits are used to feed the portunus trituberculatus, so that the ovary of the portunus trituberculatus is quickly developed, and the nutritious value and the edible value of the portunus trituberculatus are improved. The key points of the method include: the proper temperature is between 18 and 25 DEG C, the proper salt content is 25 to 35ppt, the sand is paved on the bottom of the pond, microporous oxygen-supplying tubes are arranged so as to supply oxygen to the bottom part, and the compound feed and living baits are alternately fed. Through nearly 60 days of quick roe development, the roe weight index of the portunus trituberculatus is increased from original about 1 percent to over 7 percent, the red roe rate and the survival rate are about 70 percent and 80 percent respectively, and the nutritious value and the economic value of the females are improved. The method is suitable to be used by portunus trituberculatus breeding enterprises, portunus trituberculatus catching units and fishmen and contributes to protection and reasonable utilization of wild resources of the portunus trituberculatus.

Description

technical field [0001] The invention relates to a method for rapid cream breeding of Portunus trituberculatus females, which belongs to the technical field of marine culture. Background technique [0002] Portunus trituberculatus is an important seawater economic crab in my country. It has high economic value and nutritional value. Due to the decline in the amount of wild natural resources and the increase in market demand, artificial breeding and pond culture of Portunus trituberculatus have been popular in my country since the 1990s. The coast has developed rapidly, and in 2007, the artificial breeding output of Portunus trituberculatus in my country reached about 100,000 tons. Gonads, hepatopancreas and muscles are the main edible parts of Portunus crabs, especially the price of female crabs with well-developed ovaries (commonly known as red crabs) is about three times that of females or males with poorly developed ovaries (vegetable crabs). Therefore the ovary index (als...

AI Technical Summary

Problems solved by technology

[0006] The patent of the present invention is aimed at two key problems in the culture and fishing of Portunus trituberculatus in my country: 1. Due to reasons such as water quality, pond bottom quality, temperature and bait, there are usually crab belly (abdomen) blackened and reddish in pond cultured Portunus trituberculatus Shortcomings such as lack of ointment and late time to market have seriously affected the economic value of commercial crabs and the economic benefits of breeding; two, the fishing of wild swimming crabs in my country is mainly concentrated in September-November, when the wild crab ovary index is low (less than 3%), There is less crab meat, so the nutritional value and edible value of the crab without cream are low, and the market price is usually lower, the price is only 30-50 yuan / kg, while the price of the red cream crab with plump glands is as high as 160-240 yuan / kg , the patent provides a method for rapidly raising the fat of Portunus trituberculatus females. Through the rapid fat raising (enhanced fattening) of about 60 days, the weight index of Portunus trituberculatus increases from about 1% to more than 7%, thereby improving the pond three Nutritional and economic value of Portunus trituberculatus females and sea-caught Portunus trituberculatus without ointment