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. 

Doctor Fishing Joke

June 5, 2014 | Categories: Fun Stuff

A small town Doctor was famous in the area for always catching large fish. One day while he was on one of his frequent fishing trips he got a call that a woman at a neighboring farm was giving birth. He rushed to her aid and delivered a healthy baby boy. The farmer had nothing to weigh the baby with so the Doctor used his fishing scales. The baby weighed 20 lbs 12 oz.