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1351 - 1375 of 1453
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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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Coefficients of temperature change in relation to body size are given for three species of fish native in Lake Huron, subjected to a sudden drop in ambient temperature of about 5C. These observations together with published data provide cooling coefficients for fish and aquatic reptiles over a w...
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The solubility of oxygen is so low in water that it is reasonable to dimension water flow in the fish gills in units of oxygen molecules. Each sieve unit of the tuna gill is 1064oxygen molecules wide.
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Apocynin is a well-known NADPH-oxidase inhibitor currently being investigated for its potential therapeutic use in patients with cardiovascular disease, such as occlusive stroke. However, the use of apocynin as a potential neuroprotective agent has come under criticism due to a narrow experimental t...
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In a recent paper Brown & Muir (1970) analysed the function of tuna gills from a theoretical viewpoint. Their analysis was based on Muir's work on the anatomy of tuna gills (Muir, 1969; Muir & Hughes, 1969; Muir & Kendall, 1968), and some assumptions on the physiology of tuna. In the present paper a...
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1. The ability of fish gills to transfer heat was measured by applying a heat pulse to blood in the ventral aorta and measuring it before and after passing through the gills of a teleost, Hemitripterus americanus. 2. 80-90% of heat contained in the blood is lost during passage through the gills. 3. ...
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Increased sodium pump activity is a major component of enhanced tissue thermogenesis in skeletal muscle, liver, and kidney of cold-acclimated rats. The sodium pump may play a major role in the thermoregulatory heat production during cold adaptation in mammals.
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There is considerable pressure for Animal Care and Ethics Councils to recommend using analgesics in experiments that involve fish. Although we do have some data regarding this issue, I argue that we do not know enough to recommend any being used. For example, the doses of morphine used in fish exper...
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Oxygen uptake from air and from water was measured during routine activity at 2TC in two faculta~iveair-breathing teleosts, iioplrrytl~rinus14 niraenintus and Etyrhrinlrs ~pt1trinsr.v.These fish brearhe air in hypuxic water. lsking a breath every I to 2 min. Gill ventilation increases in hypoxic wat...
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Eccentric contractions (activation during muscle lengthening) can cause muscle damage. The effect of phase of stimulation on the extent of muscle damage was studied by using the work-loop method. For the work-loop method, the muscle was subjected to sinus...
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Haemic neoplasia (HN) is a leukemia-like disease that affects at least 20 species of marine bivalves including soft shell clam, Mya arenaria. Since the disease was discovered in 1969, the etiology remains unknown. A retroviral etiology has been suggested based on the detection of reverse transcripta...
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In two GH transgenic coho salmon Oncorhynchus kisutch, the surface area of the intestine was 2·2 times that of control salmon and the growth rate was about twice that of controls. It seems likely that the enhanced intestinal surface area is a compensatory feature that is manifested in fast growin...
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The structure and morphometry of the gills of the marine teleost, red drum, have been studied. The present analysis of gas exchange area of fish gills is one of the most intensive and the results are compared to less intense averaging methods. Based on the gill area estimates, red drum falls into th...
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