A culture technique of the Changjiang River anchovy species in brackish water ponds

Abstract

The invention relates to a technology for cultivating Yangtze river coiliaectenes fingerlings of the same year in a brackish water pond, which is characterized by comprising the following steps of: selecting a water pond in an estuary region, adding natural brackish water with a salinity of 5-15 percent, carrying out bait biological inoculation at a water temperature of 25-30 DEG C and putting the fingerlings after the biomass in the pond achieves 20-40 baits / L; carrying out salinity increasing transition before the fingerlings are put into the pond, so that a difference between the salinity of water in an indoor cement pond and the salinity of the water in the pond does not exceed 0.2 percent; turning on an aerator before the fingerlings are put into the pond and ensuring that the water temperature and the salinity in a fish fry oxygen bag are close to those in the pond when the fingerlings are put, the specification of each fingerling put is 5-7 cm in full length, and the stocking density is 1,500-20,000 fingerlings / mu; turning on the aerator in advance before opossum shrimps are inoculated, wherein the aerator is turned on for 1 hour at noon in a fine day and for 5-8 hours at night; replacing 1 / 3 of water semimonthly in summer and replacing 1 / 3 of water monthly in autumn; timely supplementing when the biological density is lower than 1 bait / L and catching at a water temperature of 6-8 DEG C in winter, wherein the weight of coiliaectenes is 2.5-3.5 g, and the full length is 10-12 cm.

Description

technical field [0001] The invention relates to the culture of the common anchovy, in particular to the cultivation technology of the common fish species of the long-breasted anchovy from the Yangtze River in a brackish water pond. 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 anchovy have declined sharply...

AI Technical Summary

Problems solved by technology

At present, there are two main methods of artificial breeding of the Yangtze sword anchovy: freshwater pond cultivation and indoor cement pond cultivation, but the cultivation technology has not yet fully matured, especially for the cultivation of fish fingerlings in those days. Jiangnan seedlings, freshwater ponds, and low-density extensive farming, this farming model has exposed some shortcomings: 1) Anchovy raised in freshwater ponds often become "lake knives" in people's eyes, and their quality and market value are far lower For the "Jiangdao" that swims from the sea to the river; 2) consumes freshwater resources, the breeding density is very low, and the water needs to be changed frequently during the breeding period, if large-scale freshwater breeding of the anchovy will consume a large amount of high-quality freshwater resources