![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Betta_spawning.jpg/640px-Betta_spawning.jpg&w=640&q=50)
Fish reproduction
Reproductive physiology of fishes / From Wikipedia, the free encyclopedia
Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused.[1] There may also be a range of secondary organs that increase reproductive fitness. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish can often be determined by the shape of its papilla.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Betta_spawning.jpg/640px-Betta_spawning.jpg)
A pair of bettas spawning under a bubble nest.