Fish have the ability to smell as well as taste. This ability is called chemoreception, or detecting environmental chemical stimuli through smell and taste.Continue Reading
Fish have extremely well-developed chemoreception, especially some species of eels and sharks. Fish have two nostrils on both sides of their heads but there is no connection between the nostrils and the throat.
The chemoreception organ in fish is called the olfactory rosette. The size of this organ is proportional to a fish's sense of smell. Salmon and sharks can detect levels of a chemical that are as low as one part per billion.
Fish also have taste buds all over their mouths as well as on their lips and tongue. Some fish, such as catfish and goatfish, have whiskers, called barbels, that have taste structures.Learn more about Fish
Fish do urinate. It may be hard to tell that fish pee, because they live underwater, but if a tank starts to smell like ammonia after not being cleaned for a while, this is actually because fish do urinate.Full Answer >
Fish use their gills to breathe by extracting oxygen from the surrounding water. The oxygen that fish and other animals with gills use is bonded to hydrogen molecules and is dissolved in the water. Water molecules are composed of two parts hydrogen and one part oxygen.Full Answer >
Fish are vertebrates and therefore have backbones. Fish are sometimes observed with curved backbones. This is attributed to a variety of factors, including lack of vitamin C, injury, birth defect, temperature change while in egg and parasites.Full Answer >
Fish live in the water and breathe by absorbing oxygen through their gills. Fish are cold-blooded animals, so their internal body temperature is influenced by the environment. Many fish have scales and use their fins to swim. Fish have a spine but do not have external ears or eyelids. Fish also have air bladders, which keep them afloat.Full Answer >