It is as simple as that. But, populations are very slow to recover. This is only one example and is a bit of a special case. https://www.newsdeeply.com/ocean

It is as simple as that. But, populations are very slow to recover. This is only one example and is a bit of a special case. https://www.newsdeeply.com/oceans/articles/2017/10/13/boom-and-busted-lessons-from-alaskas-mysterious-herring-collapse https://www.newsdeeply.com/oceans/articles/2017/10/13/boom-a... Fishery collapse has happened in other areas as well. Here is an example that didn't follow a disaster. https://en.wikipedia.org/wiki/Collapse_of_the_Atlantic_northwest_cod_fishery https://en.wikipedia.org/wiki/Collapse_of_the_Atlantic_north... In all the cases I have looked at recovery is decades long.