Behaviour

After looking at videos of this interaction, I saw that the fish doesn’t seem to move a lot, they only move when they see a shark. This result in “paths” being formed where sharks go.
The waves move the fish and sharks. This can be simulated with a displacement shader.
Shark move to where there are more fish. The do ocasional “jumps” or “sprints” to catch some fish.
Fish tend to orientate themselves in the same directions as their neighbours.
When sharks do sprints, the fish just panic and go in any direction quickly. This may include off the sea into the air, causing a splash.

Untitled

Untitled