Why do fish species in some rivers have both male and female parts?



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    Hermaphroditism, which is found in some fish species, is a survival strategy that assures a reproductive partner. Similtaneous hermaphroditism is where both male and female reproductive organs are present throughout life. Sequential hermaphroditism is where the animal changes sex from male to female (protandry) or from female to male (protogyny). Pressures such as overfishing can result in sequential hermaphroditism in fish with the ability to change sex- if larger fish are targeted by fishermen they can adapt to change to the smaller sex.

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