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

Li-Yih Lin, C. F. Weng, P. P. Hwang

Research output: Contribution to journalReview article

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalPhysiological and Biochemical Zoology
Volume73
Issue number3
DOIs
Publication statusPublished - 2000 Sep 11

Fingerprint

Tilapia (Cichlidae)
Tilapia
Oreochromis mossambicus
Salinity
water balance
cortisol
Larva
drinking
Hydrocortisone
salinity
Water
larvae
Drinking
Seawater
Immersion
Water content
Fresh Water
seawater
water content
Drinking Water

ASJC Scopus subject areas

  • Physiology
  • Biochemistry
  • Animal Science and Zoology

Cite this

Effects of cortisol and salinity challenge on water balance in developing larvae of tilapia (Oreochromis mossambicus). / Lin, Li-Yih; Weng, C. F.; Hwang, P. P.

In: Physiological and Biochemical Zoology, Vol. 73, No. 3, 11.09.2000, p. 283-289.

Research output: Contribution to journalReview article

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