Fish lag fix

OUR DOCUMENTATION HAS MOVED TO SLABSERVER.ORG!

THE INFO ON THIS PAGE MAY BE OUT OF DATE!

In 1.13, fish could spawn in very large pack sizes, making it possible for several hundreds of them to spawn in a single cycle, many times above the mob cap.

This function removes naturally spawning fish when the number of natural fish exceeds 100. Fish from a bucket or with a nametag are not removed.