How do fish have sex? Basically, for some actual species of fish, reproduction is beyond casual. This is because for some species called the hermaphrodites, they have the individual ability to posses both male and female reproductive organs or actually alternate between possessing either of the two, and the the other. This literally makes the reproduction literally insane!
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However, for most species, often know as “gonochorist”, they are the common ones as they are either a female or male. That is, they possess either of the two reproductive organs instead of the two.
So, literally, how do fish have sex?
This actually depends on the species of fish mentioned. For some species, The male shortly inserts the organ into the sex opening of the female, with hook-like adaptations that allow the fish to grip onto the female to ensure impregnation. If a female remains stationary and her partner contacts her vent with his gonopodium, she is fertilized. The sperm is preserved in the female’s oviduct.
Whereas, for some other fish species, the females only release eggs into the water, males release sperm, and the eggs get fertilized. This occurs without any physical contact between both gender.
For instance, The mangrove rivulus Kryptolebias marmoratus produces both eggs and sperm by meiosis and routinely reproduces by self-fertilization.
Hence, the mating and reproduction of fish is a little bit strange and uncertainty as the sex of many fishes is not fixed, but can change with physical and social changes to the environment where the fish lives.