All fish, dolphins, squid, etc. are nowhere to be seen in the wild after the 14.3 update.
Linked issues
duplicates 1
Comments 2
Duplicates MC-148613 (fixed in 1.14.4).
MC-156023
No sea creatures in the water.
Resolved
Duplicate
0
This is not a bug because the oceans can't be generated before the aquatic update to have sea creatures. What it means to have generated oceans before is that you have already visited them, you might have just not remembered visiting them too. This isn't coming just from me by the way, Mojang said it themselves. No matter what update of Minecraft you are in.