How are fish and turtle different?

Fish and turtles differ primarily in their classification and anatomy. Fish are aquatic animals that belong to the class Actinopterygii and have gills for breathing underwater, fins for swimming, and scales covering their bodies. Turtles, on the other hand, are reptiles from the order Testudines; they have lungs for breathing air, a hard shell for protection, and limbs adapted for either swimming or walking on land. Additionally, turtles are ectothermic (cold-blooded), while fish can vary in their thermoregulation strategies.