Coilia ectenes step type breeding method

Abstract

A coilia ectenes step type breeding method comprises the nine steps of reserved parent pool simulated ecological cultivation, parent pool intensive culture, parent selection for induced spawning, parent induced spawning, natural insemination, germ cell collection, germ cell incubation, indoor intensive fry rearing in a cement pool and large-scale fry culture in an outdoor pool. The method is characterized in that filial-generation coilia ectenes adult fishes which are more than 2 years old and cultured by manpower are used as reserved parents for artificial propagation, and a natural ecology cultivation mode is simulated; the selected parents are transported and placed in an induced spawning pool, after parent induced spawning is conducted, the germ cells are collected, counted and transferred to an incubation pool, after the germ cells are collected, the germ cells are placed in the incubation pool with water, fries open the mouths 5-6 days after membrane rupture is conducted, yolks and freshwater rotifers which are filtered through a 80-mesh silk net are fed to the fries, after the fries are cultivated for 15 days, the fries are divided to different pools, and when the fries are as long as 20-30 mm, the fries are placed to outdoor pools to be cultivated.

Description

technical field [0001] The invention relates to aquaculture, in particular to a method for breeding silverfish. Background technique [0002] Swordfish ( Coilia nasus Schlegel), also known as long-jawed anchovy, commonly known as saury, hair saury, is a river-sea migratory fish, mainly distributed in the Yellow Sea and the East China Sea in my country, and distributed in all rivers leading to the sea, with the highest production in the lower reaches of the Yangtze River. Anchovy from the Yangtze River is famous for its tender meat, fresh and fat, and strong seasonality. It is also known as the "three delicacies of the Yangtze River" together with shad and puffer fish in the Yangtze River. The resources of anchovy in the Yangtze River are extremely rich in history. 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, the output has shown a downward t...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main breeding methods for the anchovy: one is the pond ecological breeding method, that is, after the pond is disinfected, an appropriate amount of breeding-age parents is put in to allow them to mate, lay eggs, and hatch naturally. The seedlings are also cultivated. In this pond, the ecological cultivation of the pond is carried out, the water is changed in an appropriate amount, and there is very little manual intervention. When the fry reach a certain size, the net is drawn to estimate the number. Systematic training is required, but this method has a very low survival rate of seedlings. It relies entirely on natural breeding, and the unit output is very small. Sometimes there are no surviving fry in some ponds, so the overall number of seedlings obtained is also small; the other It is an intensive breeding method in indoor cement pools, that is, artificial induction of labor in indoor cement pools, artificial incubation of fertilized eggs in indoor cement pools, and indoor cultivation of seedlings in cement pools. The advantage of this method is that artificial breeding is completely carried out under artificial control conditions, and the survival rate of seedling cultivation It is relatively high and can obtain batches of seedlings. However, in the middle and later stages of seedling cultivation, due to the growth of individual fry, the food intake will increase greatly. At this time, a large amount of live bait is required, and a large amount of labor is required to catch the live bait from the pond. Put it into the indoor cement pond, and at the same time, the stocking density of large-scale fish fry in the cement pond should be greatly reduced, which will occupy a large amount of indoor cement pond, and also require a lot of labor to do tedious feeding, bottom suction, water change, and pond turning and other tedious seedling operations