The research group led by Associate Professor Toshinao Inano of the Shingu Experiment Station, Kinki University Fisheries Research Institute, succeeded in messing up all cultured catfish using soy isoflavone for the first time in Japan.If unisexual aquaculture of females is realized, the variation in growth due to gender differences can be reduced and the production efficiency can be improved.
According to Kinki University, the research group raised fry of hatched catfish in breeding water containing genistein, which is one of the components of soy isoflavone, for 1 days, and then from day 15 to day 16 in breeding water without genistein. Was raised and dissected to examine the gonads.
As a result, catfish grown for 1 days in breeding water in which 400 micrograms and 800 micrograms of genistein were dissolved per liter were 15% femaleized. 100% of catfish grown in breeding water containing 1 micrograms of genistein per liter for 100 days also became female.
Catfish raised for 1 days in breeding water containing 200 micrograms of female hormones per liter became 15% female, but when raised in normal breeding water, the proportion of females was 100%.
Soy isoflavones act like female hormones in living organisms. Growing on soy isoflavones at a concentration of 1 micrograms or more per liter gave catfish the same effect as female hormones, and the research group will use this method in the future to raise female butterfly sharks at the Shingu Experiment Station. I'm going to challenge the change.
