Some fish make sounds by grating their teeth and others, like some catfish, make sounds from their air filled swim bladder.

Scientists can tell how old a fish is by reading the growth rings on the fish scales, a lot like they do with tree rings.

August 24, 2011 | Categories: From the Gremlin

Scientists can tell how old a fish is by reading the growth rings on the fish scales, a lot like they do with tree rings.