. The biology of marine animals. Marine animals; Physiology, Comparative. 354 THE BIOLOGY OF MARINE ANIMALS residing in the protein fraction. These fish are not responsive to water which has contained food fish. Dogfish and teleosts cease to respond to hidden food when the nostrils are plugged or the olfactory nerves severed (22, 109, 117, 152). The role of smell in orientation is indicated by conditioned responses to naturally occurring environmental odours. Salmon can detect stream. Fig. Olfactory Epithelium of Petromyzon (after Ballowitz and Plate.) Siz, sense cells; Stz, supporting c
. The biology of marine animals. Marine animals; Physiology, Comparative. 354 THE BIOLOGY OF MARINE ANIMALS residing in the protein fraction. These fish are not responsive to water which has contained food fish. Dogfish and teleosts cease to respond to hidden food when the nostrils are plugged or the olfactory nerves severed (22, 109, 117, 152). The role of smell in orientation is indicated by conditioned responses to naturally occurring environmental odours. Salmon can detect stream. Fig. Olfactory Epithelium of Petromyzon (after Ballowitz and Plate.) Siz, sense cells; Stz, supporting cells; B, boundary of subepithelial blood space. odours and discriminate between then, an ability which may be of value during migration. Pond minnows (Hyborhynchus) are able to discriminate between the odours of different aquatic plants (64, 145). In behaviour studies involving conditioning, Bull (21) has demonstrated that many species of marine teleosts are able to detect very small changes in acidity and salinity. Positive conditioned responses were obtained in many species to changes of pH 0-1 or more, and most fish could detect^ a change of pH 0-04-0-06. Salinity changes of the order of 0-06%o to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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