The effect of temperature and acclimation period on repeat swimming performance in cutthroat trout

Abstract

Hatchery cutthroat trout Oncorhynchus clarki clarki were used to examine the effects of 48 h and 3 week temperature acclimation periods on critical swimming speed (U crit ). The U crit was determined for fish at acclimation temperatures of 7, 14 and 18 C using two consecutive ramp-U crit tests in mobile Brett-type swim tunnels. An additional group was tested at the stock's ambient rearing temperature of 10 C. The length of the temperature acclimation period had no significant effect on either the first or the second U crit (U crit-1 and U crit-2 , respectively) or on the recovery ratio (the quotient of U crit-2 U crit-1 À1 ). As anticipated, there was a significant positive relationship between U crit-1 and temperature (P < 0Á01) for both acclimation periods, and an increasing, though non-significant, trend between U crit-2 and temperature (P ¼ 0Á10). Acclimation temperature had no significant effect (P ¼ 0Á71) on the recovery ratio. These results indicate that a 48 h acclimation to experimental temperatures within the range of À3 to þ8 C of the acclimation temperature may be sufficient in studies of swimming performance with this species. This ability to acclimate rapidly is probably adaptive for cutthroat trout and other species that occupy thermally variable environments. # 2004 The Fisheries Society of the British Isles

The effects of caudal fin loss and regeneration on the swimming performance of three cyprinid fish with different swimming capacities

“…The maximum sustainable swimming speed, or critical swimming speed (U crit ), has long been a widely used parameter for the evaluation of aerobic swimming ability (Plaut, 2001;MacNutt et al, 2004;Li et al, 2010). The maximum oxygen consumption (active oxygen consumption rate, M O2active ) during the U crit test was assumed to be the maximum aerobic metabolic capacity (Alsop and Wood, 1997;Lee et al, 2003;Fu et al, 2011).…”

Calibration of a bioenergetics model linking primary production to Atlantic menhaden Brevoortia tyrannus growth in Chesapeake Bay

“…Faster swimming speed at warmer temperatures is reported for a broad range of fish species and is attributed to faster biochemical reaction rates, improved muscle contraction and cardiac performance, and lower water viscosity (reviewed in MacNutt et al 2004). When examined over a sufficiently broad range of temperatures, the functional response is often a bellshaped curve with swimming speed decreasing above an optimum temperature (Koumoundouros et al 2002, Lee et al 2003, MacNutt et al 2004, Fangue et al 2008, Zeng et al 2009). …”

Effects of Logging Second‐Growth Forests on Headwater Populations of Coastal Cutthroat Trout: A 6‐Year, Multistream, Before‐and‐After Field Experiment

“…Our treatment streams were naturally warmer than control streams. Had the PDO changed in 1998-1999, creating a 28C warmer (instead of cooler) climate than that of the prelogging period, it is possible that we would have found a decline in trout abundance or condition in treatment streams because average temperatures would have exceeded 188C, the metabolically optimal temperature for cutthroat trout (MacNutt et al 2004), and maximum daily temperatures could have risen above 238C, which is the lethal limit for coastal cutthroat trout LOGGING EFFECTS ON TROUT POPULATION AND HABITAT (50% mortality after 1,000 min; fish acclimated at 208C; Bjornn and Reiser 1991).…”