School of fish ball protecting from predators. Aka Bait Ball ...
Adam Rifkin stashed this in Fishies!
Can't the shark just chip away at the outside?
The Bait Ball confuses the predators and there is safety in numbers.
Sharks have very sensitive noses. The vast majority of their sensory input comes from there and apparently it's like getting kicked in the balls. By doing this, the shark cannot really get at the fish without getting smacked in the snout.
If you are swimming and you see a shark, punch its nose!