Saponins and Surfactants Increase Water Flux in Fish Gills.

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  • Umezu Takeshi
    National Research Institute of Fisheries Science, Yokosuka Station

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Other Title
  • サピニン・界面活性剤による鰓の水透過の促進
  • サポニン・界面活性剤による鰓の水透過の促進〔英文〕
  • サポニン カイメン カッセイザイ ニ ヨル エラ ノ ミズ トウカ ノ ソクシ

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Description

With tritiated water (THO), we can follow up the diffusional water flow in fish body. Some pollutants may affect the THO flux, which occurs independently of osmotic gradients. The effects of 25 chemicals were determined on the THO influx in 8 species of marine (longchin goby, girella, red sea bream, etc) and fresh water fish (medaka) of small size (0.2-1.5g) for 15 min exposure. Saponins of 2ppm doubled the THO influx ( ?? 100% increase), digitonin and anionic synthetic surfactants (LAS, SDS, Aerosol-OT) had similar effect. Nonionic surfactant Tween 20 (2-20ppm) was less effective ( ?? 40%) and Triton X-100 was barely effective at 80ppm. Except for these surface active agents, the other 18 chemicals were without effect at the concentrations tested. A gill perfusion test with eels, showed saponin to act on gills, the major site for water exchange, but not the skin or oesophagus.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 57 (10), 1891-1896, 1991

    The Japanese Society of Fisheries Science

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