Actually it’s just animation with keyframe. I did add some IK constrain on the rigging to make it smoother, and not move every bone by hand.
Yeah i found it funny to add giant fish that swim not in water but in air, my idea was swimming outside water, i may add some that swim on ground later, maybe run too just for fun. It will be my first big project where i kinda implement what i want to learn or found funny, tweek to match the theme and core idea.