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Some fish groups produce and conduct sounds to communicate. Talking fish was perceived to be ungrounded before, but a new study shows that some fishes are capable of producing noises and sounds to communicate with other fishes.
Hundreds of thousands of fish working together can create a wave effect that protects them from birds. There are up to 4,000 fish per square meter and sometimes hundreds of thousands of fish participate in a single fish wave. At first, researchers didn't completely understand what the fishes were doing.