Hundreds of Squid and Salmon spawn in a river

Put the summary of the bug you're having here
WE just discovered hundreds of squid and salmon causing serious lag on the world
What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...