The type of fertilization fish use in water?

Fish use external fertilization. This means that the eggs are fertilized outside of the female's body. Here's how it works:

1. Spawning: The female fish releases eggs into the water.

2. Fertilization: The male fish releases sperm (milt) over the eggs, and fertilization takes place in the water.

There are some variations in this process, but the fundamental principle remains the same:

* Broadcasting: Some fish release eggs and sperm into the open water, relying on currents to bring them together.

* Nest building: Some fish create nests, either by digging in the substrate or using plants, where the eggs are laid and fertilized.

* Parental care: Some species, like cichlids, exhibit parental care where one or both parents protect the eggs and young fry.

This is a simplified explanation, and there are many different strategies fish use to ensure successful reproduction. However, the key point is that fertilization happens outside the female's body, in the water.