Info-Icon Facility Closure Alert

TPWD Austin Headquarters is open but some field offices and state parks are operating at limited capacity. See the Texas State Parks alert map for more information.

Get Out! Explore Texas Fun Stuff Wild Things

Fish Scales

Fish with bones have scales. Some fish, such as gar, have heavy, plate-like scales called ganoid scales. Other fish have thinner scales. Fish scales form rings as they grow. During the cold months, scales grow more slowly and leave a ring on the scale. Like rings on a tree, you can count rings on a scale for clues on the age of fish. This is easier to do with fish that live where winter temperatures are cooler. Fish without scales include catfish, sharks, most eels, lampreys and rays.