Morpholine, Bile Acids and Skin Mucus as Possible Chemical Cues in Salmonid Homing: Electrophysiological Re-Evaluation

@inproceedings{Hara1984MorpholineBA,
  title={Morpholine, Bile Acids and Skin Mucus as Possible Chemical Cues in Salmonid Homing: Electrophysiological Re-Evaluation},
  author={Toshiaki J. Hara and S. Macdonald and Robert E. Evans and Takayuki Marui and Shigeru Arai},
  year={1984}
}
The olfactory-imprinting and pheromone hypotheses of salmon homing recognize the involvement of olfaction in the recognition of the homestream. However, physiological basis for olfactory recognition and the nature of homestream odors have not yet been established. In this paper the state of knowledge and advances in the study of chemical cues relevant to salmonid homing are reviewed, with special emphasis on 1) imprinting to morpholine, 2) skin mucus as a chemical signal, and 3) chemoreceptor… 

Highly independent olfactory receptor sites for naturally occurring bile acids in the sea lamprey, Petromyzon marinus

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Electro-olfactogram recording data demonstrate that conspecific bile acids are discriminated by the olfactory epithelium of the sea lamprey, supporting the possibility that these compounds may function as migratory pheromones.

Olfaction and gustation in fish: an overview.

  • T. Hara
  • Biology
    Acta physiologica Scandinavica
  • 1994
TLDR
Putative receptors, molecular mechanisms of transduction and the role played by olfaction and gustation in feeding, reproduction, migration and other fish behaviours are discussed.

Sublethal effects of copper on coho salmon: Impacts on nonoverlapping receptor pathways in the peripheral olfactory nervous system

TLDR
Examination of data indicates that copper is broadly toxic to the salmon olfactory nervous system, and short‐term influxes of copper to surface waters may interfere with Olfactory‐mediated behaviors that are critical for the survival and migratory success of wild salmonids.

High correlation between microvillous olfactory receptor cell abundance and sensitivity to pheromones in olfactory nerve-sectioned goldfish

TLDR
Recovery of electro-olfactogram sensitivity to all odorants was slow and erratic over the next 6 months, particularly to the pheromones, and data suggest that microvillous receptor cells mediate responsiveness to phersomones in this species.

Olfactory sensitivity to amino acids in the juvenile stages of the European eel Anguilla anguilla (L.)

TLDR
Recording of underwater electro-olfactograms (EOGs) showed that various amino acids (glycine, L-alanine,L-valine), L-leucine and L-asparagine are effective stimulants for the olfactory mucosa; leucine was more stimulatory at the GE than at the EL stage.

Lake char (Salvelinus namaycush) olfactory neurons are highly sensitive and specific to bile acids

TLDR
It is concluded that lake char possess multiple olfactory receptors capable of discriminating bile acids produced and released by conspecifics.

Hormones, pheromones and chemoreception

TLDR
This chapter reviews these advances from an historical perspective, paying particular attention to the endocrinological and neural basis of pheromone function in teleost fish, with emphasis on the goldfish, Carassius auratus, because it represents the best-understood model of sex pherOMone function.

A new model for olfactory imprinting in salmon

TLDR
Results suggest that populations of olfactory receptor neurons may be selectively tuned to respond to odor molecules present during a hormonally linked sensitive period of development.
...

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