The external anatomy of a fish includes the mouth, scales, fins, nares, eyes, and gills. However, you should know that some have more external parts.
This is a visible line running down the fish’s length, consisting of fluid-filled sacs and hair-like elements that open to the water through microscopic holes.
Fish uses the mouth for feeding purposes. The mouth’s shape, size, and placement speak more about their feeding habits.
Although fish don’t breathe through noses, they have a pair of nostrils called nares, which detects odors in the water. Fish use their sense of smell to locate a mate, detect chemicals in the water and predators.
As in other vertebrates, fish have a kidney whose primary function is to excrete nitrogenous waste. It filters out liquid waste from the blood, which later passes out of the body.
The fish liver produces fluids like albumin and bile that aid in digestion. It also removes toxins from the food consumed and cleans the bloodstream