In Jaws 2 , the shark gets burned when it bites into a live electrical cable near the power station at Cable Junction, and the shock sets it on fire.

What happens

  • Chief Brody lures the shark toward the cable.
  • The shark snaps at it and gets electrocuted.
  • The electrical surge ignites the shark, leaving it burned before it dies.

In plain terms

It is basically an accident turned into the final kill: the shark’s mouth closes on the cable, the current runs through it, and the fire follows immediately.

Quick scoop

The shark wasn’t burned earlier in the story; the burn happens at the end, when Brody uses the power line as the trap.

TL;DR: the shark in Jaws 2 gets burned because it bites an electrical cable and is electrocuted, which sets it on fire.