They produce small eggs. Bigger eggs then the parasaur which is dumb however if you happen to spawn close to a Leetchy you can use the prime fish to tame a few females to egg farm. They are small enough so you can have quite a bit of food and simple kibble is ez enough to make. Also if you're far away you can throw it on your shoulder to bring it back home. Simple kibble is good for alot of starter tames.