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...

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...

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...

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...

In a previous study we showed that many of the morphological features of the respiratory system of GH (growth hormone) transgenic Atlantic salmon are greater than similarly sized control salmon. Here we show that the manifestation of GH transgene is similar in two different lines of GH transgenic Pa...

Strips of isolated rat diaphragm muscle were attached to a servomotor–transducer apparatus, and the muscle length was cycled in a sinusoidal fashion about the length at which maximum isometric twitch force was developed, L_o. The amplitude of the length displacement (excursion ...

Rev. of The biology of the lampreys by M.W. Hardeistry and I.C. Potter

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...

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...

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 pre...

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 ...

Rainbow trout were exposed to sublethal waterborne Cd (5 and 10mugL(-1)) and dietary Ca (60mgg(-1)), individually and in combination, for 30d to elucidate the interactive effects and evaluate the toxicological significance of mitochondrial responses to these cations in vivo. Indices of fish conditio...

Molecular features of cadmium (Cd) and calcium (Ca) uptake and toxicity in rainbow trout liver mitochondria were studied using modulators of mitochondrial permeability transition pore (MPTP), mitochondrial calcium uniporter (MCU) and rapid uptake mode (RaM). Malate-glutamate energized mitochondria w...