| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for breeding fish having high feed efficiency by developing a strain of fish having high feed efficiency and using the fish.SOLUTION: Feed efficiency in fish breeding is increased by adopting as breeding object fish, fish having the functional deficit of leptin or leptin receptor. Breeding of the fish having the functional deficit of leptin or leptin receptor is performed with an amount of feeding less than an amount of ingestion of bait in full feeding to corresponding wild-type fish. The fish having the functional deficit of leptin or leptin receptor is a leptin or leptin receptor defective homozygote. Since the leptin or leptin receptor defective homozygote fish has fertility, it is easy to proliferate by mating the male and female of the homozygote, and consequently, stable breeding of fish having high feed efficiency is achieved by using the leptin or leptin receptor defective homozygote fish. |
