Tetris Effects - The Deep

I want render meshes like the way render the stingrays/whales like this video

Is this all particle effect or a mesh / shader effect with some particles thrown in? Is there any assets / or shaders or examples that get closed to this?

Thanks.

You would use meshes and particle systems, but the meshes would mainly be to drive some particle targets.

Keijiro has a lot of useful resources to put stuff like this together
https://github.com/keijiro/Smrvfx

And a bunch more VFX examples on his profile.

Thank you very much for the pointers. I will looking into it and give it a shot.

Visual Effect Graph would also save a lot of time with this kind of effect, but you need to construct some tool or use existing ones to get animated meshes in. All those blinking and deformation effects would be then quite easy to do in VFX Graph.