Title: Effects of constant and cyclical thermal regimes on growth and feeding of juvenile cutthroat trout of variable sizes
Author: Meeuwig, M. H.; Dunham, J. B.; Hayes, J. P.; Vinyard, G. L.
Source: Ecology of freshwater fish. 13(3): 208–216
Publication Series: Not categorized
Description: The effects of constant (12, 18, and 24°C) and cyclical (daily variation of 15–21 and 12–24 °C) thermal regimes on the growth and feeding of Lahontan cutthroat trout (Oncorhynchus clarki henshawi) of variable sizes were examined. Higher constant temperatures (i.e., 24°C) and more variable daily temperatures (i.e., 12–24°C daily cycle) negatively affected growth rates. As fish mass increased (from 0.24 to 15.52 g) the effects of different thermal regimes on mass growth became more pronounced. Following 14 days exposure to the thermal regimes, feeding rates of individual fish were assessed during acute exposure (40 min) to test temperatures of 12, 18, and 24°C. Feeding rate was depressed during acute exposure to 24°C, but was not significantly affected by the preceding thermal regime. Our results indicate that even brief daily exposure to higher temperatures (e.g., 24°C) can have considerable sublethal effects on cutthroat trout, and that fish size should be considered when examining the effects of temperature.
Keywords: Oncorhynchus clarki henshawi, cutthroat trout, temperature, growth, feeding, thermal regime, water quality
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Meeuwig, M. H.; Dunham, J. B.; Hayes, J. P.; Vinyard, G. L. 2004. Effects of constant and cyclical thermal regimes on growth and feeding of juvenile cutthroat trout of variable sizes. Ecology of freshwater fish. 13(3): 208–216
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility