Nostrils. The nostrils of fish do not open into the back of the mouth as do those of mammals, and are not, therefore, for breathing. They lead into organs of smell which are as a rule, very sensitive, so that a fish can detect the presence of food in the water at considerable distances. read more
Fish do not breathe through their noses, but they do have two small holes used for smelling, which may, indeed, be called nostrils. The Procellariiformes are distinguished from other birds by having tubular extensions of their nostrils. read more
The nostrils (nare) of fish are used for the sense of smell, just like yours. The sense of smell is also called olfaction. read more
The nostrils (nare) of fish are used for the sense of smell, just like yours. The sense of smell is also called olfaction. Fish have olfactory bulbs just like terrestrial (i.e., land) vertebrates have, sensitive to the same type of odorants (i.e., olfactory chemicals). read more