Excited to share this fish rig that I've been working on. It was a fun challenge figuring out the best way to approach rigging it. I wanted to be able to switch between a full body control system and a system where the head can be moved independently of the spine.
I ultimately settled on a blend between regular FK where head and spine are independent, and a full body ribbon rig for IK with an added sine deformer to make an easy auto swim animation.
All of the fins also have 2-Way FK control system, where each fin can be animated with a single "paddle" control, as well individual joint controls on top of that, so you can get some nice poses without needing to key a ton of controls.
Check it out, and let me know what you think!
Model Credits: https://www.cgtrader.com/free-3d-models/animals/fish/tuna-fish-9f41924a-83d4-478e-a8e9-370946f141b3