What kind of courtship do fish display?

This is almost as varied as there are fishes in the world. Fish use literally hundreds of different ways of attracting a mate. Some are very subtle while others are very long and wide to see.

Sticklebacks actually build an underwater nest with only a hole at each end to protect the eggs and later the hatched babies.

Most tetras swim quickly through plants and leave a trail of fertilized eggs behind them.