Relationship between sexual plasticity and body growth in Koi carp

2014 Fiscal Year Final Research Report

• Project/Area Number: 24580285
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: General fisheries
• Research Institution: Teikyo University of Science & Technology
• Principal Investigator: HIRAI Toshiaki 帝京科学大学, 生命環境学部, 教授 (30238331)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 性分化 / 生殖腺 / 遺伝子 / 成長 / ニシキゴイ

Outline of Final Research Achievements

In this study, we investigated the relationship between sexual plasticity and body growth to provide a basis for workable methods for sex control in aquaculture. Genetically controlled female (all-XX) or male (all-XY) populations of Koi carp with different growth rate were fed a diet containing an aromatase inhibitor (AI) or estradiol respectively on serial treatment schedules, and their gonads were subjected to histological analysis. The results demonstrate that the emergence of sexual dimorphism is closely related with body growth, and thereafter, sexual plasticity declines with the progression of gonadogenesis rapidly in male and gradually in female. Finally, we have presented an improved protocol for masculinization applicable in Koi carp aquaculture.

Free Research Field

生殖生物学