These fish need cold and clean water to reproduce successfully.

With less competition, both species are able to reproduce successfully underground.

The main "reason" a species survives over time is that it can successfully reproduce.

His results have never been successfully reproduced, and are therefore scientifically meaningless.

The better adapted animals are the most likely to survive, and to reproduce successfully (natural selection).

However, rainbow trout can successfully reproduce in freshwater and obviously continue to do so.

The reality is that the vast majority of species exposed to a new habitat do not reproduce successfully.

For every female on the spawning bed, there is a minimum of 2 males that are used to successfully reproduce.

When the pH of the water is below 5.5 the roach cannot reproduce successfully.

In contrast, most first-year females successfully reproduce during their first breeding season.