A method for ecological early propagation of cuttlefish from the Yangtze River in greenhouses

Abstract

The invention provides a method for ecologically and early breeding Yangtze River coilia ectenes in a pond greenhouse, and relates to coilia ectenes cultivation. The method comprises production steps of parent overwintering and strengthening cultivation, breeding parent stocking, mysis inoculation, daily management, fish fry number estimation and parent removing. The method is characterized in that when the water temperature of an outer pond is reduced to 7-8 DEG C from December to January in the following year, healthy two-age coilia ectenes without surface damage is taken as parent fish and transferred to the pond greenhouse for overwintering and strengthening cultivation; after the parent fish enters the greenhouse, 3 kilograms of exopalaemon carinicauda are put into the pound for each mu, and the mysis is inoculated; from the end of March to the middle ten days of April, the water temperature rises to 15-16 DEG C, overwintered and strengthened parent fish is picked and transferred to an ecological breeding pond, growth and feeding conditions of the fish fry are checked every one week, and the density of fish bait in water is adjusted according to the checked conditions; a seine is used for removing the parent fish in the middle ten days and last ten days of June, 1, 000-2, 000 fish fry can be generally seined each mu, the fish fry specification is that the total length is 7-10 cm and the weight is 1.8-2.5 g, and the fish fry can be taken as culturing offspring seeds.

Description

technical field [0001] The present invention relates to aquaculture, especially the ecological early breeding technology of the Yangtze River cuttlefish in a greenhouse. Background technique [0002] Swordfish ( Coilia ectenes ), belonging to the order Herringiformes, Anchovyidae, and Anchovy, commonly known as saury, hairy saury, mackerel, 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 that lead 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. It is one of the "three delicacies of the Yangtze River". 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 Yangtze River anchovy have declined sharply, while the market demand has continued unabated...

AI Technical Summary

Problems solved by technology

However, at present, the breeding cycle of the Yangtze sword anchovy is relatively long, generally takes 3-4 years, and most of them adopt the extensive farming mode, and the breeding density is low, resulting in low turnover rate and utilization rate of the pond. Ecological reproduction and artificial propagation in ponds can only start in mid-to-late May, and indoor artificially propagated seedlings can be released into ponds in early to mid-July (fry size 4-5cm), and it will take another month to grow to 7-5 cm in early August. 10cm-sized fish fry that can be primed to feed on compound feed