Routine metabolism of mosquitofish (Gambusia affinis) at three different salinities


AKIN Ş. , Neill W.

TEXAS JOURNAL OF SCIENCE, vol.55, no.3, pp.255-262, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 3
  • Publication Date: 2003
  • Title of Journal : TEXAS JOURNAL OF SCIENCE
  • Page Numbers: pp.255-262

Abstract

This study examined the influence of environmental salinity, ranging from near 0 ppt (freshwater) to 20 ppt, on routine metabolism of adult female mosquitofish at 20degreesC. Routine metabolic rate (RMR) averaged 0.19, 0.14 and 0.17 mg O-2 g(-1) h(-1) at 0, 10 and 20 ppt salinity, respectively. Limiting oxygen concentration (LOC) averaged 1.36, 0.93 and 1.12 mg O-2 l(-1) at 0, 10 and 20 ppt salinity, respectively. Both RMR and LOC at 10 ppt were significantly lower than at 0 ppt, but neither was significantly lower at 10 ppt than at 20 ppt. Marginal metabolic scope (MMS = (RMR/LOC) * 1 mg O-2 l(-1)) was 0.14, 0.15 and 0.15 mg O-2 g(-1) h(-1) at 0, 10 and 20 ppt salinity, respectively. These slight differences in MMS among salinities were not significant, suggesting that the adult female mosquitofish's metabolic capacity varies little over the salinity interval 0 to, 20 ppt.