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In 1996, F2 growth hormone-transgenic Atlantic salmon (Salmo salar) were produced using eggs from a transgenic F1 female and milt from a non-transgenic male. Non-transgenic control fish were also produced from the same stock. All fish were reared at 12-13°C and fed a commercial pelleted ration for ...
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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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To test predictions of biochemical symmorphosis, we measured the activity of seven consecutive glycolytic enzymes at three positions along the heterothermic white muscle of the bluefin tuna. Biochemical symmorphosis predicts that adjustments in sequential enzyme concentrations along a thermal gradie...
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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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Numerous environmental features have the potential to act as 'barriers' to fishes in the field. Passage of these 'barriers' depends on two main properties: willingness (behavioural) and physiological capacity. The physiological swimming capacity of fishes has been well studied. However, because most...
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We measured enzyme activities along a heterothermic tissue, the visceral retia mirabilia of the bluefin tuna, to test current theories of enzyme temperature adaptation. The heterothermic tissue model is ideal for the study of fundamental temperature adaptation because it eliminates confounding effec...
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Amphibious mangrove killifish, Kryptolebias marmoratus (formerly Rivulus marmoratus), are frequently exposed to aerial conditions in their natural environment. We tested the hypothesis that gill structure is plastic and that metabolic rate is maintained in response to air exposure. During air exposu...
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We investigated the effects of the chorion on movement and growth in rainbow trout (Oncorhynchus mykiss) embryos. To test if the chorion restricts movement and growth before hatching, we manually removed the chorion 3-6 days before the natural time of hatching (dechorionated) and compared movement, ...
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Growth hormone transgenic coho salmon Oncorhynchus kisutch fed at the same ration level as non-transgenic controls (Tc) had the same growth rate as non-transgenic controls (Nt). In contrast, growth hormone transgenic coho salmon (Tf) fed ad libitum ate about twice as much and had much higher growth ...
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Pirarucu, weighing 2 to 3 kg, ventilated their gills 16to 24 times per minute and ventilated their lungs every 1to 2 min. Average oxygen uptake from water was 23 mg. h ' .kg-l; average oxygen uptake from air was 80 mgh-'.kg-'. That is, in normoxic water they obtain about 75% of the...
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