Ecological breeding techniques of the second-year-old fingerling of the Yangtze River anchovy and the white prawn in brackish water

Abstract

The invention discloses a brackish-water ecological cultivation technology for Yangtze-river two-year-old coilia ectenes fingerlings and exopalaemon carinicauda. The technology is characterized by comprising the following steps: firstly, an estuary-area earth pond and natural brackish water with an inflow salinity of 0.5-1.5% are chosen, and food organism is inoculated in the pond; secondly, an aerator is opened before fingerlings are put in the pond in winter or in early spring, wherein the stocking size of the fingerling is a total length of 10 to 20 cm, and the stocking density of the fingerlings is 500 to 600 fishes per mu; thirdly, putting the exopalaemon carinicauda into the pond, wherein the stocking density of the exopalaemon carinicauda is 6 to 12 jin per mu, and the stocking size is 200 to 280 fishes per jin; after the fingerlings and exopalaemon carinicauda are put in the pond, 1 / 3 of water is changed each month from January to June, 1 / 3 of water is changed each half month from July to September, and 1 / 3 of water is changed each month from October to December; fourthly, prawn artificial pellet feed which is adopted as exopalaemon carinicauda feed is fed 1 time per day, wherein the feeding amount is 1 to 3 percent of the weight of the exopalaemon carinicauda; finally, the fingerlings and exopalaemon carinicauda are captured with nets in winter at the temperature of 6 to 8 DEG C, wherein the specification of the captured coilia ectenes is 16 to 20 gram per fish while the specification of the exopalaemon carinicauda is 100 to 150 fishes per jin.

Description

technical field [0001] The invention relates to a fish and shrimp polyculture method, in particular to a semi-salt water ecological polyculture technology for the second-year-old fish species of the Yangtze anchovy anchovy and the white prawn. Background technique [0002] Swordfish ( Coilia ectenes ), belonging to the order Herringoformes, Anchovyidae, and Anchovy, commonly known as saury, hairy saury, hairy flower fish, bearded fish, and anchovy. It is mainly distributed in the Yellow Bohai Sea and the East China Sea in my country. It can be seen in all the rivers leading to the sea, such as the Liaohe River, the Haihe River, the Yellow River, the Yangtze River, and the Qiantang River. It is famous for its tender meat and delicious taste. rare migratory fish. In recent years, due to the influence of many factors such as overfishing and the deterioration of the ecological environment, the resources of the anchovy have declined sharply, while the market demand has continued...

AI Technical Summary

Problems solved by technology

[0003] At present, the pond culture technology of the scorpion anchovy is not yet fully mature, and most of them adopt the mode of irrigated seedlings, low-density stocking and macrobrachium japonica polyculture in freshwater ponds. This culture mode has exposed some shortcomings: 1) Growing in freshwater ponds The common anchovy often becomes the "lake knife" in people's eyes, and its quality and market value are far lower than the "river knife" that swims from the sea to the river; 2) It consumes fresh water resources, and the breeding density is very low, and it needs Changing the water frequently, large-scale freshwater farming of chrysalis will consume a large amount of high-quality freshwater resources; if using brackish water to raise chrysalis can alleviate the problem of low quality of freshwater aquaculture chrysalis, and can save precious freshwater resources, and brackish water Water is formed by mixing fresh water from rivers and rivers as it flows into the sea, and is common in coastal estuaries around the world

However, due to the short reproductive cycle of spinytail shrimp, there are multiple generations in the later stage of breeding, and the individual differences are large, which leads to many individuals not reaching the commercial specification when they are caught.