Polyculture method of the second-year-old species of swordfish and money fish in ponds

Abstract

The invention discloses a pond polyculture method for Yangtze-river two-year-old coilia ectenes fingerlings and scatophagus argus. The method is characterized by comprising the following steps: firstly, an estuary-area 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, fingerlings are put in the pond in winter or in early spring, wherein the stocking size of Yangtze-river two-year-old coilia ectenes fingerlings is a total length of 10 to 12 cm, and the stocking density thereof is 500 to 600 fishes per mu; thirdly, the scatophagus argus is put in the pond from the end of April to the beginning of May, wherein the stocking density is 150 to 250 fishes per mu,and the stocking size is 20 to 30 gram per fish; fourthly, 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; fifthly, food organism is supplemented timely when the density of the food organism is lower than 1 per litre; sixthly, during a cultivation period, artificial pellet feed is supplemented as the feed for the scatophagus argus, opossum shrimp and crustacean 1 to 2 jin per mu and 1 time per day; finally, fishes are captured with nets in early winter, wherein the specification of captured coilia ectenes is 16 to 20 gram per fish while the specification of the scatophagus argus is 110 to 130 gram per fish.

Description

technical field [0001] The invention relates to aquaculture, in particular to the pond ecological culture technology of the second-year-old fish species of the Yangtze river anchovy and money fish. 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 unabated, and even reached the dilemma of hav...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the cultivation of sword anchovy in the Yangtze River adopts the mode of irrigation with seedlings and low-density extensive ponds, but this cultivation technology is not yet fully mature: for example, due to the low breeding density and the lack of a large amount of feed, the water quality of the sword anchovy pond is clear , the transparency is very high, so that there will be a large number of large filamentous algae in the pond of cuttlefish: most of the freshwater ponds are Spirogyra, and most of the seawater ponds are Enteromorpha; After being completely absorbed, the filamentous algae will die in large numbers after the peak period, causing water quality to deteriorate; in addition, due to the slender body of the sword anchovy, it is difficult for the sword anchovy species to get out of the filamentous algae group by mistake and cause death