Reconciling the two methods of measuring upper lethal temperatures in fishes

Kilgour, D. Marc; McCauley, Robert W.

doi:10.1007/bf00001494

Cited by 66 publications

(70 citation statements)

References 15 publications

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“…Final tolerances are influenced by acclimation temperature, thermal history, and heating rate (Becker and Genoway 1979;Jobling 1981;Kilgour and McCauley 1986), and the results of this study demonstrate that acclimation temperature significantly affects thermal tolerance. A heating rate that is too fast will result in thermal shock, whereas a heating rate that is too slow may result in partial acclimation of the fish, biasing the tolerance limit upward.…”

Section: Discussionmentioning

confidence: 89%

“…Temperature LC 50 values ranged from 28.2°C (±1.8°C) to 30.7°C (±0.8°C) (Ziegeweid 2006). Because acclimation temperature has been shown to affect thermal tolerance (Brett 1952;Becker and Genoway 1979;Jobling 1981;Kilgour and McCauley 1986;Young and Cech 1996), the results of Ziegeweid (2006) need to be re-evaluated with fish acclimated to a range of temperatures.…”

Section: Introductionmentioning

confidence: 98%

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Thermal maxima for juvenile shortnose sturgeon acclimated to different temperatures

2007

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Many populations of shortnose sturgeon, Acipenser brevirostrum, in the southeastern United States continue to suffer from poor juvenile recruitment. High summer water temperatures, which may be exacerbated by anthropogenic activities, are thought to affect recruitment by limiting available summer habitat. However, information regarding temperature thresholds of shortnose sturgeon is limited. In this study, the thermal maximum method and a heating rate of 0.1°C min −1 was used to determine critical and lethal thermal maxima for young-of-the-year (YOY) shortnose sturgeon acclimated to temperatures of 19.5 and 24.1°C. Fish used in the experiment were 0.6 to 35.0 g in weight and 64 to 140 days post hatch (dph) in age. Critical thermal maxima were 33.7°C (±0.3) and 35.1°C (±0.2) for fish acclimated to 19.5 and 24.1°C, respectively. Critical thermal maxima significantly increased with an increase in acclimation temperature (p<0.0001).Lethal thermal maxima were 34.8°C (±0.1) and 36.1°C (±0.1) for fish acclimated to 19.5 and 24.1°C, respectively. Lethal thermal maxima were significantly affected by acclimation temperature, the log 10 (fish weight), and the interaction between log 10 (fish weight) and acclimation temperature (p<0.0001). Thermal maxima were used to estimate upper limits of safe temperature, thermal preferences, and optimal growth temperatures of YOY shortnose sturgeon. Upper limits of safe temperature were similar to previous temperature tolerance information and indicate that summer temperatures in southeastern rivers may be lethal to YOY shortnose sturgeon if suitable thermal refuge cannot be found.

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 98%

Thermal maxima for juvenile shortnose sturgeon acclimated to different temperatures

2007

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“…CT max and CT min were defined as the maximum and minimum temperatures, respectively, at which loss of equilibrium was detected, based on the fish's loss of ability to maintain dorso-ventral orientation (Kilgour and McCauley, 1986).…”

Section: Determining Thermal Limitsmentioning

confidence: 99%

Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker,Gillichthys mirabilis

Jayasundara

Somero

2013

Journal of Experimental Biology

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SUMMARYAn insufficient supply of oxygen under thermal stress is thought to define thermal optima and tolerance limits in teleost fish. When under thermal stress, cardiac function plays a crucial role in sustaining adequate oxygen supply for respiring tissues. Thus, adaptive phenotypic plasticity of cardiac performance may be critical for modifying thermal limits during temperature acclimation. Here we investigated effects of temperature acclimation on oxygen consumption, cardiac function and blood oxygen carrying capacity of a eurythermal goby fish, Gillichthys mirabilis, acclimated to 9, 19 and 26°C for 4weeks. Acclimation did not alter resting metabolic rates or heart rates; no compensation of rates was observed at acclimation temperatures. However, under an acute heat ramp, warm-acclimated fish exhibited greater heat tolerance (CT max =33.3, 37.1 and 38.9°C for 9°C-, 19°C-and 26°C-acclimated fish, respectively) and higher cardiac arrhythmia temperatures compared with 9°C-acclimated fish. Heart rates measured under an acute heat stress every week during 28days of acclimation suggested that both maximum heart rates and temperature at onset of maximum heart rates changed over time with acclimation. Hemoglobin levels increased with acclimation temperature, from 35gl −1 in 9°C-acclimated fish to 60-80gl −1 in 19°C-and 26°C-acclimated fish. Oxygen consumption rates during recovery from acute heat stress showed post-stress elevation in 26°C-acclimated fish. These data, coupled with elevated resting metabolic rates and heart rates at warm temperatures, suggest a high energetic cost associated with warm acclimation in G. mirabilis. Furthermore, acclimatory capacity appears to be optimized at 19°C, a temperature shown by behavioral studies to be close to the speciesʼ preferred temperature. Supplementary material available online at

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“…In our study three species of fish which inhabit intermittent streams were selected to evaluate the interacting effects of dissolved oxygen and aquatic surface respiration (ASR) on upper temperature tolerances as determined by the Critical Thermal Maximum (CTM) method (Becker & Genoway 1979, Paladino et al 1980, Kilgour & McCauley 1987. Fundulus notatus (blackstripe topminnow), a cyprinodontid with a superiorly positioned mouth, Notropis lutrensis (red shiner), a mid-water column cyprinid with a terminally positioned mouth and Pimephales vigilax (bullhead minnow), a benthic cyprinid with a subterminally positioned mouth were chosen as representatives of microhabitats within north Texan intermittent summer pools.…”

Section: Introductionmentioning

confidence: 99%

The effects of dissolved oxygen and aquatic surface respiration on the critical thermal maxima of three intermittent-stream fishes

Rutledge

Beitinger

1989

Environ Biol Fish

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SynopsisCritical thermal maxima (CTM) were determined for three species of fish in hypoxic (1.2 mg I-]), normoxic (7 mg I-') and hyperoxic (12 mg I-') oxygen tensions. All fish were acclimated to 30°C under a regulated photoperiod of 12:12. During each CTM determination, one-half of the test fish were allowed free access to the surface (to permit aquatic surface respiration) while the remaining one-half were denied access to the surface. Under hypoxic conditions, CTMs of Fundulus notatus, Notropis lutrensis and Pimephales vigilax given access to the surface were significantly higher than those of conspecifics without access to the surface. With access to the surface, all species had significantly lower CTMs under hypoxic conditions than under normoxic and hyperoxic conditions. CTMs measured under normoxic and hyperoxic conditions were not different for any of the test species. Under all comparable oxygen tensions with surface access, F. notatus had the highest CTM, N. lutrensis intermediate and P. vigilax had the lowest CTM. The critical oxygen concentration for N. lutrensis during CTM determinations occurred between 1.2 and 2 mg I-'.

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Reconciling the two methods of measuring upper lethal temperatures in fishes

Cited by 66 publications

References 15 publications

Thermal maxima for juvenile shortnose sturgeon acclimated to different temperatures

Thermal maxima for juvenile shortnose sturgeon acclimated to different temperatures

Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker,Gillichthys mirabilis

The effects of dissolved oxygen and aquatic surface respiration on the critical thermal maxima of three intermittent-stream fishes

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