If Fitch expected the idea to work how does he explain the fact that there were any left after they stopped attacking him. Wouldn't they have just eaten each other up then? OK that's the extent of my questioning the film (otherwise I'd be here all week.) Now my attempt at explaining the ending. As you watched the giant fish tear into the wounded one you will notice that it never gets any smaller. My theory, and the one Fitch obviously figured out, was that even when decapitated and being devoured these fish will continue to grow exponentially and as long as the food source continues to grow the others will keep attacking it and leave everything else alone. To this day, off the Florida Keys (or was it the panhandle, I forget where the attack actually occurred since they mentioned both places)there is a huge swarm of giant piranhas attacking a single dead but still growing fish and that is keeping the world safe.
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