Most fish have a nose!
Fish, for the most part, don’t rely too heavily on scent in their aquatic environment. But, just for good measure, they do have a nose. It has no connection with the mouth nor does it play any role in respiration. It generally consists of a pair of small pouches located at the front or side of the head.
In most primitive living vertebrates, there is only one nostril. Some fish use their noses to smell prey. Other use their noses to navigate the deep blue see. For example, Salmon have a tremendous sense of smell and use it to sense the stream where they were born, so that they may return to it again when it is time for them to have their own babies.