When in a flock/school of gold fishes, if male fishes are removed due to some reason and only female fishes remain. It is said that after sometime one of the female fish will turn into male and the school again will have a male head. How is such sex change possible?

  • $\begingroup$ I never heard of it in carp , but it is common in some reef fishes and tropical fishes. For commercial tilapia farms , hormones are added to food or water of very young fish to make them nearly all males ( males are much larger). $\endgroup$ – blacksmith37 Sep 9 '19 at 15:42

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