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We review studies claiming that fish feel pain and find deficiencies in the methods used for pain identification, particularly for distinguishing unconscious detection of injurious stimuli (nociception) from conscious pain. Results were also frequently misinterpreted and not replicable, so claims th...
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Tuna are unusual among fish in that they are warm bodied. It is agreed that one adaptive advantage to being warm is that the warmth increases the rate of delivery of oxygen from the cell boundary to the mitochondria by myoglobin. Tuna have extremely high rates of oxygen uptake, much higher than othe...
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Rainbow trout, Oncorhynchus mykiss, were injected with an adrenergic agonist. an adrenergic antagonist, or a cholinergic antagonist, via a dorsal aorta cannula. Spleen size and haemoglobin content were measured at rest and, for antagonists, following an air exposure stress. Injection of phentolamine...
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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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We examined the effects of midline and off midline incision locations, acid incisions closed with monofilament or silk suture on spontaneous swimming behaviour in fish. Each fish had a dummy transmitter surgically implanted into its peritoneal cavity. The behaviour of fish in each treatment was esti...
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Specific activity and kinetic constants of trypsin from the pyloric caeca of rainbow trout (Salmo gairdneri) were estimated. Although one group was fed more than twice as much as the other (1.8 compared with 0.7% body weight daily), there was no significant difference in the weight of the pyloric ca...
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Giant bluefin tuna (Thunnus thynnus) warm their viscera during and after a meal. The caecum of a 500-kg bluefin weighs about 9 kg and contains about 20 000 pyloric caeca, each about 10 cm long and 1.5 mm diameter. Trypsin was assayed with α-benzoyl-DL-arginine-p-nitroanilide HCl and chymotrypsin wi...
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The acetic acid test is commonly used in conscious mammals to determine nociceptive thresholds and efficacy of analgesics. The purpose of the present study was to examine the response of rainbow trout that were not anaesthetised during the acetic acid test. Rainbow trout (n=31) were trained to eat i...
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The objective of our study was to estimate the overall (aerobic and anaerobic) energy expenditure involved in hatching in rainbow trout (Oncorhynchus mykiss) embryos. During hatching, there were significant increases (50% and 19%, respectively) in movement and oxygen consumption. There were no diffe...
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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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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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The purposes of the present study were to examine the rate of morphine uptake in goldfish (Carassius auratus (L., 1758)) when administered via the water, to calculate the pharmacokinetics of morphine when administered intraperitoneally, and to determine whether morphine could act as an analgesic. Wh...
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Gill tissue was sampled from salmon (Salmo salar) that were transgenic for somatotropin and from non-transgenic control salmon. The transgenics were the F2 generation produced using eggs from a transgenic F1 female and milt from a non-transgenic male. At the time when the gill tissues were sampled, ...
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As growth hormone transgenic Atlantic salmon consume more food to support their rapid growth, a study was conducted to determine if the morphology of the digestive tract would reflect these accelerated processes. Offspring from a non-transgenic cross that was spawned on the same day as the test fish...
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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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Pain is a major sympton in many medical conditions, and often interferes significantly with a person's quality of life. Although a priority topic in medical research for many years, there are still few analgesic drugs approved for clinical use. One reason is the lack of appropriate animal model...
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Fish were sampled individually, at rest, following air exposures of up to 8 min, during recovery from a 5 min air exposure or after a 5 minute chase. The spleen was photographed in vivo at rest and following 5 min air exposure in one fish. The effect of individual versus serial sampling from the sam...
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