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. 

40% of all fish species inhabit fresh water, yet less than .01% of the earth’s water is fresh water.

March 26, 2012 | Categories: From the Gremlin

40% of all fish species inhabit fresh water, yet less than .01% of the earth’s water is fresh water.