This was a really fun update. I made lots of fish models for the underwater and fishing update, as well as created a swim vertex shader to animate them in the wild without having to use bones.
All fish were hand-painted in substance painter using many, many layers.
Adding to this project: some more animated critters using the same movement shader.
Video showing simple vertex swim shader
More critters using my vertex movement shader
The vertex movement shader works with more complicated life