Artificial eel propagation method

Abstract

The invention relates to an artificial eel propagation method, which includes: a, ripening parent fishes, breeding catadromous parent reels for seven days, gradually increasing salinity of water, and subjecting the parent eels to back intramuscular injection of ripening agent-carp pituitary gland homogenate and HCG (human chorionic gonadotropin); b, performing induced spawning of the parent eels, subjecting female eels to injection of oxytocin 17 alpha-hydroxyl progesterone and HCG, subjecting sperm-producing male eels to injection of mixture of CPE (carp pituitary extract) with HCG, collecting naturally spawned fertilized eggs on the next day, and subjecting the female eels laying no eggs to semi-dry artificial insemination; and c, hatching the fertilized eggs, immediately transferring the fertilized eggs to a special-made hatching barrel for hatching, and slightly aerating, changing half of water every four hours until fry are hatched successfully. The artificial eel propagation method has the advantages that anesthetic loss and operational injury can be prevented, injection dosage of hormones is reduced, a great amount of eels can mate and lay eggs naturally under artificial induced spawning, artificial insemination can be complete securely in a planned way, level of high-quality fertilized eggs and alevin of eels artificially propagated is increased.

Description

technical field [0001] The invention relates to a method for artificial reproduction of river eels, specifically, river eels obtain sexually mature female eels and male eels under the control of artificial hormones, and obtain a large number of fertilized eggs and early seedlings of river eels through artificial insemination and natural mating Methods. Background technique [0002] River eel, scientific name Japanese eel ( Anguilla Japonica ), is one of the most important migratory fish in Asia. It has undergone several metamorphosis processes in its life history, growing and fattening in fresh water, and then spawning and reproducing in the ocean. At present, the seedlings needed for river eel farming are completely dependent on natural fishing. my country has experienced the process of exporting eel fry fishing in the 1970s, relying on imports for some eels in the early 1990s, and finding it difficult to catch seedlings in the Yangtze River Estuary in the late 1990s. Du...

AI Technical Summary

Problems solved by technology

In the process of artificial reproduction, there are problems such as asynchronous male and female development, poor induction efficiency, low fertilization rate, unstable hatching, and open bait cannot be solved.

And the long-term lack of understanding of the ecological conditions for natural breeding in the ocean, the artificial reproduction of river eels has become a recognized problem in the world

In 2010, after more than 40 years of research, the Japanese Fisheries Research Center announced that it had completed the artificial reproduction of river eels, but the rate of induced birth, fertilization rate, hatching rate, and survival rate during the breeding process were extremely low, and high-cost input ( Seedlings are about 1 million yen per head), and the experimental operating conditions are far from meeting the needs of mass production

However, there is no report about the method of obtaining mature female and male eels under the control of artificial hormones, and obtaining a large number of fertilized eggs and early seedlings of river eels through artificial insemination and natural mating.