Give an example of how knowledge of the biology and life history of a particular fishery could help ...

By learning the biology, behavior, and life cycle of a particular species we can regulate the fishing of that species and limit it to periods or areas that would limit the impact on the population of the species. As an example, if a species of fishes tended to predominantly spawn in the spring, then it would make no sense to fish it extensively in the late winter when the adults have not yet reproduced. By doing so the fishers are catching the adults and preventing the establishment of offspring that will comprise future populations.