Effects of cortisol and salinity challenge on water balance in developing larvae of tilapia (Oreochromis mossambicus)

L. Y. Lin, C. F. Weng, P. P. Hwang

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22 引文 斯高帕斯(Scopus)

摘要

Effects of exogenous cortisol on drinking rate and water content in developing larvae of tilapia (Oreochromis mossambicus) were examined. Both freshwater- and seawater-adapted larvae showed increases in drinking rates with development. Drinking rates of seawater-adapted larvae were about four- to ninefold higher than those of freshwater-adapted larvae from day 2 to day 5 after hatching. Seawater-adapted larvae showed declines in drinking rate and water content at 4 and 14 h, respectively, after immersion in 10 mg L-1 cortisol. In the case of freshwater-adapted larvae, the drinking rate decreased after 8 h of cortisol immersion, while the water content did not show a significant change even after 32 h of cortisol immersion. In a subsequent experiment of transfer from freshwater to 20 ppt (parts per thousand, salinity) seawater, immersion in 10 mg L-1 cortisol for 8-24 h enhanced the drinking rate in larvae at 4 h after transfer, but no significant difference was found in water contents between cortisol-treated and control groups following transfer. These results suggest that cortisol is involved in the regulation of drinking activity in developing tilapia larvae.

原文英語
頁(從 - 到)283-289
頁數7
期刊Physiological and Biochemical Zoology
73
發行號3
DOIs
出版狀態已發佈 - 2000 九月 11

ASJC Scopus subject areas

  • Physiology
  • Biochemistry
  • Animal Science and Zoology

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