Ok, this is absurd. There are too many squid and salmon spawning in both oceans and rivers. I personally haven't experienced this problem before 1.14.1. Although this would make for a good farm, it causes way too much lag when I get close to it.
MC-153098
Too many salmon and squid spawning
Resolved
Duplicate
1
Minculescu Cristi
(Unassigned)
Unconfirmed
Mob spawning
Minecraft 1.14.1
Retrieved
Update: The same problem applies to Cod. Unfortunately, I don't have a screenshot, but I'll provide one asap.