Method for artificial mass propagation of rice field eel seedlings

Abstract

The invention relates to a method for artificial mass propagation of rice field eel seedlings, and belongs to the technical field of scientific application of fishery. The method is characterized by applying oral oxytocic hormone to rice field eels, namely feeding parent rice field eels with a certain dosage of oxytocic hormone by using animal bait as a carrier of the oxytocic hormone; and the method comprises the following steps of: stopping feeding of both male and female parent rice field eels for 1 day before spawning induction; observing oestrus conditions of bubbling and nesting of the male and female rice field eels in 3 to 4 days after the male and female rice field eels ingest an oxytocic hormone liquid medicament, and surrounding and marking nests with eichhornia crassipes after the nesting of the parent rice field eels is finished, wherein an inner net cage in a paddy field is used as a spawning pond; and naturally inseminating the parent rice field eels in the spawning pond, breaking membranes by fertilized ova and emerging seedlings after 144 hours, inhabiting all fish fries in the eichhornia crassipes surrounding the nests of the parent rice field eels after the fish fries break the membranes after 96 hours, and collecting the rice field eel seedlings at the time. By applying the method of the invention, the spawning induction ratio of the parent rice field eels reaches 80 to 90 percent, the hatching rate of natural spawning and fertilization is over 95 percent and the collection ratio of the rice field eel seedlings is over 95 percent.

Description

Technical field: [0001] The invention relates to a method for artificially multiplying eel seedlings in batches, and 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 large-scale artificial breeding of rice field eels, artificially bred seedlings are in short supply, and currently 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 or more; at the same tim...

AI Technical Summary

Problems solved by technology

[0003] However, in the process of large-scale artificial breeding of rice field eels, artificially bred seedlings are in short supply, and currently 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 or more; at the same time, wild seedlings must be introduced and released 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.