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Biomedical subjects

R Selset

Publications and source records attributed to R Selset.

5 recordsLinked to original sources
PubMed1980

Behavior patterns in cod released by electrical stimulation of olfactory tract bundlets.

The olfactory tracts in the cod (Gadus morhua L.) consist of four bundlets. Three were cut symmetrically in both sides leaving only one of the four bundlets intact. Weak electrical pulses given to the uncut bundlets elicited, for each, a different behavior pattern in free-swimming cod. The results support a spatial basis for olfactory discrimination and open new experimental possibilities linking the neuroanatomical substrate and fish behavior.

Animals↗
PubMed1980

Comparison of mucus collecting methods in fish olfaction.

A new method for collecting non-contaminated skin mucus from fishes is introduced. The method is compared with a "customary" method by gel filtration, analysis of free amino acids, and determination of dry weight. Skin mucus collected by the "customary" method is shown to be contaminated by intestinal juice. The role of skin mucus as a source of fish odorants affecting fish behaviour is discussed in the light of the above findings.

Amino Acids↗
PubMed1980

Behaviour of mature anadromous char (Salmo alpinus L.) towards odorants produced by smolts of their own population.

Mature anadromous char (Salmo alpinus L.) of a specific population were tested in behaviour experiments with respect to attraction effects of smolts of the same population, smolt material, and chemical fractions of that material. The char reaction indicated preference for intestinal contents and possibly bile from own population over skin mucus material and food. Chemical fractions isolated from the intestinal contents were tested for attraction at a concentration of 1.5 x 10(-9) g per 1. One of the fractions attracted the mature char. The results are discussed in relation to the "migration pheromone" hypothesis proposed by Nordeng (1971) as being crucial for the return of anadromous salmonids to their home river's spawning grounds.

Animals↗
PubMed1980

Olfactory sensitivity to bile acids in salmonid fishes.

Monopolar DC-recordings were made simultaneously from two positions on the olfactory bulb of chars (Salmo alpinus L.) and graylings (Thymallus thymallu L.) using bile acids and amino acids as olfactory stimulants. The bile acids induced responses with characteristic spatial differences from those of the amino acids. The distribution of responses to bile acids indicated a neuronal activity in the medial part of the bulb. In contrast, amino acids elicit responses in the lateral part of the bulb. Taurine conjugated bile acids were up to 1 000 times more potent as olfactory stimuli than methionine. The results suggest that olfactory receptors are of two types, one responding to bile acids, the other to amino acids. 3 -alpha-hydroxysteroids are released from the fish into the water in quantities that suffice for detection by their olfactory system. The odorant potency of the bile acids, their evolutionary history and variability, together with their renowned adherent properties made them interesting candidates for specific signals in the acquatic environment.

Amino Acids↗