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We present the first measurements of routine oxygen uptake (VO2) of the bloater (Coregonus hoyi), including the effects of temperature and hydrostatic pressure. For temperature experiments, ten 24 hour trials were conducted each at 10.5°C and 7°C, using flow-through respirometry. Average routine V...
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We analyzed buoyancy characteristics ( buoyancy range, gas bladder volume, and lipid content) of adult bloater, Coregonus hoyi Gill, in the Laurentian Great Lakes. Buoyancy was measured directly in individual bloater and compared with the hydrostatic pressures at the depths of capture. The results o...
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Objective - To assess the cardiorespiratory effects of morphine sulfate and evaluate whether morphine blocks cardiac responses to a noxious stimulus in winter flounder. Animals - 42 winter flounder (Pseudopleuronectes americanus) that were acclimated at 10°C. Procedures - Each fish was fitted with ...
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Stimulus trains of varying pulse number and pulse frequency were applied to the isolated pectoral adductor muscle of the sunfish Lepomis gibbosus. The number of pulses varied from 1 to 70, and the pulse frequency varied from 10 to 500 Hz. Muscle was continuously cycled at 2 Hz, and work was measured...
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We made a single intraperitoneal (IP) injection of morphine sulfate (40 mg/kg) into winter flounder and seawater acclimated rainbow trout at 10°C and then followed its disposition by measuring the change in plasma morphine concentration for 100 h using a morphine specific ELISA. Disposition also wa...
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The force-velocity relation during oscillatory work was compared with that measured in the traditional way with quick release and force clamps using toad sartorius, frog sartorius, and mouse soleus muscles. Plotting the force and corresponding velocity data in this way produces a 'power-loop&ap...
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To understand the functional-physiological influences on the depth distribution of deepwater cisco (bloater), Coregonus hoyi, in the Laurentian Great Lakes, we compared their gas bladder anatomy with the putative ancestor, shallowwater cisco, C. artedi, from a shallow inland lake. There were no gene...
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Many poikilotherms are known to adjust the membrane composition of their cells in response to a temperature change so that membrane fluidity, and therefore function, is conserved. Such compensatory changes in membrane composition are considered "homeovvscous adaptations." In this study, we...
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Using implanted acoustical tags, the body temperature and external water temperature of rainbow trout and Arctic char were monitored in commercial fish pens moored in an environment which was extremely stratified with respect to temperature and salinity. Both species regulated body temperature betwe...
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In mammals, sprint-type exercise protocols induce muscular adaptation different from that caused by endurance training. Although there are many published studies on endurance training in fish, few have examined sprint (anaerobic) training. This study is an examination of whether sprint-training chan...
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