Physiology of Finfish and Shellfish (2+1)

3.3.2. Chemoreception

Odors and tastes are quite distinguishable to the great majority of terrestrial animals. Olfactory organs, stimulated by airborne molecules are more sensitive and chemical specific than gustatory organs, which are generally stimulated by contact with dilute solutions. In fish, both types of organs are sensitive to ‘contact’ stimuli of chemicals dissolved in water. Besides differences in sensitivity, the 2 sensory systems are also distinguished by the location of the sensory receptors. Olfactory organs reside in special pits; gustatory receptors are often more dispersed on external surfaces or in the mouth.