| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| 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.
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