For any animal, releasing sperm cells requires a bit of time and energy. Using up so much energy can keep them from the other ...

For any animal, releasing sperm cells requires a bit of time and energy. Using up so much energy can keep them from the other required work of survival, including finding food and water or sleeping.

Others, like groupers, can alter their colors to let other fish know they’re willing to mate. Flashing bright colors can also warn off other fish, or even attract prey. Fish from the depth may ...

This impacts reproduction due to the fact that groupers only reproduce at spawning events, when fish from a certain area congregate to find a mate at a specific location a handful of times per year.