Fish are believed to communicate with each other for different reasons,including attracting mates,scaring off predators or orienting themselves.
Ghazali discovered that the gurnard species had a wide vocal repertoire and kept up a constant chatter while the cod usually kept silent except when they were spawning perhaps because they used sound as a synchronization so that the male and female release their eggs at the same time for fertilization.As opposed to that,the goldfish were found to have excellent hearing but were incapable of making sound of any sort.
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