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Baby fish are noisier than expected: gray snapper larvae may communicate with knocks, growls.
Larval fish can produce some tiny growls and little percussive knocks.
The first published recordings of sounds from larval fish reveal that gray snappers (Lutjanus griseus) only about a month old and a centimeter long make noises at night, says Claire Paris of the University of Miami in Florida. The noises may help larvae cluster with their own kind as the fish journey through the ocean in the dark, Paris and colleagues speculate in the October Biology Letters.
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