How to complete a Literature Review on Environmental Effects on Fishing?

need help narrowing down the list of the most important environmental effects of fishing. Can you provide me with some of the most important parts that should be included?

The most significant impacts to the environment that are caused by fishing are whether fish are available, what happens when areas and populations are overfished, and the creation and management of fisheries. In many cases, the level of fishing taking place is not a sustainable practice, which can have broader impacts on ecosystems and, eventually, the entire planet.