Do fish shrink when they are out of water? I was told by a guy that they do shrink 1/4"-1/2" and I was wondering if this is true? How do the rangers handle a case when a fish was caught and measured to be of legal length then shrinks once in the cooler? I had landed a 18.5" rock after measuring and later measured the same fish to be just over 18". Just wanted to know so I can throw back 18"ers next time.