Parent cultivation method for batch production of ricefield eel offspring seeds

Abstract

The invention relates to a parent cultivation method for the batch production of ricefield eel offspring seeds. The method is characterized by comprising the following steps of: selecting artificially fed ricefield eels with body lengths of 25-35cm as parent cultivation objects, wherein the proportion of female parent eels to male parent eels is (2-3):1, and the female parent eels and the male parent eels are separately cultivated; putting a net cage with an area of 2-5m<2> in a paddy field, and then flatly spreading soil of 18-20cm into the net cage, wherein the water level is 8-10cm higher than the soil in the net cage; and carrying out reinforced cultivation for 40-45 days, wherein the breeding density of the parent eels is controlled to be below 0.5kg / m<2>, and foods for the parent eels during cultivating are animal baits. For the parent eels cultivated by applying the invention, the survival rate reaches higher than 95 percent, the gonad maturation coefficient of the female eels is improved to be higher than 20 percent from 5 percent in a wild state, the later rate of inducing spawning can reach higher than 90 percent, the hatchability rate can reach higher than 95 percent, and the induced spawning of the parent eels can be carried out 10-15 days earlier, thereby the growth period of the ricefield eel offspring seeds in high-temperature seasons is prolonged, and the economic benefit of production can be effectively improved.

Description

Technical field: [0001] The invention relates to a parent breeding method for batch production of eel seedlings, which belongs to the technical field of fishery science application. Background technique: [0002] Swamp eel is one of the main famous and high-quality fishes in my country, and its aquaculture has developed very rapidly in recent years. Its main aquaculture production areas are located in Hubei, Hunan, Anhui, Jiangxi, Zhejiang and other provinces. Field eel farming has become the leading industry in aquaculture in some regions. [0003] However, in the process of artificial breeding of rice field eels, artificially bred seedlings are in short supply, and the seedlings invested are mainly wild rice field eel seedling resources. Breeding wild eel seedlings has a low survival rate in production. During the introduction and domestication stage of seedlings from April to June each year, the mortality rate is as high as 60%. At the same time, wild seedlings must be i...

AI Technical Summary

Problems solved by technology

[0003] However, in the process of artificial breeding of rice field eels, artificially bred seedlings are in short supply, and the seedlings invested are mainly wild rice field eel seedling resources

Breeding wild eel seedlings has a low survival rate in production. During the introduction and domestication stage of seedlings from April to June each year, the mortality rate is as high as 60%. At the same time, wild seedlings must be introduced and put in after June each year. The breeding cycle is short, with only 4 months of breeding time per year

In addition, since wild seedlings come from different waters, it is easy to cause cross-infection of rice field eel diseases in different regions.

Therefore, wild rice field eel seedlings cannot meet the requirements of large-scale and industrialization of rice field eel breeding in terms of stocking time, quality, quantity, and source.