How do fish reproduce?

How do fish reproduce?

Fish do not breed the same way. In addition, the breeding sites differ according to the species.
The pike :

Between February and April, spawners reach shallow areas rich in vegetation, where the water warms up quickly because the grass is used as a breeding ground. Once fertilized, the eggs develop, after 100 to 120 days of incubation, give rise to tiny larvae 8 to 9 mm in length, then become fry. In the wild, very few eggs reach maturity for reasons of predation, poor water quality ...
Trout :

Between October and January, trout move upstream of their stream. The reproduction happens on the gravel. The female digs a bowl with strokes of tail to deposit between 1000 to 2000 eggs per kilogram of its weight. Once the eggs are released the female then covers them with gravel to keep them safe from predators.