The objective of this research was to determine the effect of freshwater acclimation on the swimming performance and plasma osmolarity of gulf killifish Fundulus grandis. Fish were acclimated to either freshwater or brackish water (10‰ salinity) for 10 d before experimentation. Plasma osmolarity was significantly lower in the freshwater-acclimated fish; however, no significant changes occurred in plasma osmolarity in fish recovering from a swim challenge at either salinity. Critical swimming speeds of the fish acclimated to freshwater were significantly lower than those of fish acclimated to brackish water. Furthermore, the swimming challenge caused 40% mortality in the freshwater fish but no mortality in the brackish-water fish. Acclimation of gulf killifish to freshwater environments appears to have a substantial metabolic cost.
|Original language||English (US)|
|Number of pages||5|
|Journal||Transactions of the American Fisheries Society|
|State||Published - Sep 1997|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science