ON THE STIMULATION OF FISH CHEMORECEPTORS BY DILUTE SOLUTIONS OF POLYELECTROLYTES

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  • 小西 治兵衛
    Laboratory of Physiology and Ecology, Faculty of Fisheries Mie Prefectural University
  • 日高 磐夫
    Laboratory of Physiology and Ecology, Faculty of Fisheries Mie Prefectural University

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1. Stimulatory effects of various organic compounds upon the carp chemoreceptors, responsive specifically to dilute electrolyte solution, were studied by recording the electrical responses from the palatine nerve supplying the palatal chemoreceptors.<BR>2. The palatal chemoreceptors were stimulated by dilute solutions of disodium 5'-inosinate, dipotassium α-D-glucose-1-phosphate, tetramethylammonium chloride, choline chloride, sodium glutamate, disodium-lead ethylenediamineteraacetate, Congo red, Ponceau PR, Naphthol yellow, Amaranth, Direct sky blue, sodium alginate and sodium carboxymethyl cellulose.<BR>3. In general, the higher the valency of the anion, the greater the maximum of the response-concentration curve. Some exceptions were observed. Intensity of the distilled water effect (a wash response produced by distilled water) appeared to decrease as the size of the anion increased.<BR>4. An electrolyte having no net charge (glycine) and a non-electrolyte (glucose) appeared to have nothing to do with this specific receptor system.<BR>5. Several anionic surface active agents were studied. Cetyltrimethylammonium bromide, dodecylpyridinium chloride, sodium dioctylsulfosuccinate and sodium dodecyl sulfate elicited positive responses; but these compounds were occasionally injurious to the palatal chemoreceptors and therefore it was difficult to say whether or not these salts stimulated the specific recepter system.

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