An Environmental Factor Stimulating Salinity Tolerance and Branchial Chloride Cells in a Euryhaline Teleost <i>Poecilia reticulata</i>

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  • An Environmental Factor Stimulating Salinity Tolerance and Branchial Chloride Cells in a Euryhaline Teleost Poecilia reticulata
  • Environmental Factor Stimulating Salini

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Abstract

The present study examined a factor in seawater which stimulates salinity tolerance and the number and size of branchial chloride cells in the guppy. Salinity tolerance was measured as LD50 24h after transfer to serial concentrations of salinity. LD50 significantly increased from 25.8 ppt to 43.3 ppt 5 days after exposure to 15 ppt dilute seawater. Thus, increases of salinity tolerance were examined on the basis of 5 days' exposure to various solutions which were contained within 15 ppt dilute seawater. LD50 significantly increased in 0.180M NaCl and 0.023M MgCl2 but not in 0.012M Na2SO4, 0.004M CaCl2, or 0.004M KCl. During 5 days' exposure to 0.090M MgCl2, 0.090M Na2SO4, 0.090M CaCl2, or 0.180M KCl which contain the same Na+ or Cl- concentrations as 0.180M NaCl, all guppies died in 0.180M KCl. Using mixtures of NaCl and KCl, it was revealed that more than 0.020M K+ caused death of the guppies. LD50 did not change after exposure to 0.090M Na2SO4 which contains the same Na+ concentration as 0.180M NaCl but significantly increased after exposure to 0.090M MgCl2 and 0.090M CaCl2 which contain the same Cl- concentration as 0.180M NaCl. The number and size of chloride cells did not change in 0.090M Na2SO4 but significantly increased in 0.180M NaCl, 0.090M MgCl2, and 0.090M CaCl2. These results suggested that environmental Cl- stimulates salinity tolerance and the number and size of branchial chloride cells in the guppy.

Journal

  • Fisheries science

    Fisheries science 64 (2), 329-333, 1998

    The Japanese Society of Fisheries Science

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