Fish keep disappearing.

What I expected to happen was...:
Fish swiming around in all waters.

What actually happened was...:
Fish all disappeared, they were gone in the seas, rivers and just all waters.

Steps to Reproduce:
1. Get a fish spawnegg (cod, tropical fish, salmon).
2. Go to a water.
3. Spawn a ton of fish.

4. Wait a few minutes.

5. Look if there is any fish left, (there is none for me).