Acoustic telemetry showed that stomach temperature from large bluefin tuna, Thunnus thynnus, held in an impoundment, changed during feeding. The stomach cooled rapidly on ingesting cold food. It then warmed to a maximum of 10° to 15°C above water temperature over a period of 12 to 20 h. Temperatur...

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We investigated the influence of oxygen demand (developmental stage) and supply (hypoxia, water flow rate, the chorion and body movements) on the oxygen concentration within the boundary layer next to the chorion of embryos or skin of larvae of rainbow trout (Oncorhynchus mykiss). Oxygen microelectr...

Most athletes stretch as part of their training regimen and it is commonly believed that this practice prevents muscle injury. We tested this belief using an animal model, in situ mouse extensor digitorum longus (EDL) muscle. One lower hindlimb was slowly stretched for 1 min on alternate days for 12...

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...

Swimbladder walls of lake charr, Salvelinus namaycush, from Great Slave Lake (GSL), Northwest Territories, Canada, were unusually thick for the species. The thinnest sections of the GSL bladders (mean = 2.44mm, range = 1.1-4.4mm) were significantly thicker (P = 0.001) than lake charr swimbladders co...

An electron microscopic study of the red and white muscle fibres in the trunk musculature of the Kawakawa tuna ( Euthynnus affinis ) was carried out with a view to correlating their structure with metabolic adaptation. The red fibres which are considerably smaller in diameter (34.58 µm ± 6.16 ...

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.

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...

Passive integrated transponder (PIT) tagging is a commonly used procedure to identify fish. However, there is a lack of research on the short-term effects of such tagging. The purpose of our study was to measure the short-term effects of PIT tagging on the feeding behavior and swimming performance o...

We investigated the effects of preparing surgical incision sites with a topical antiseptic on wound healing and hematological response in rainbow trout Oncorhynchus mykiss. A povidone–iodine solution was applied both pre- and postsurgery to the incision sites on treated fish. Three-cent...

A popular part of many athletes pre-game regime is to stretch. We examined whether a pre-injury stretching protocol could prevent acute contraction-induced injury. The in situ extensor digitorum longus (EDL) muscle of an anesthetized mouse (80 mg/kg intra-peritoneal) was used. Damage to the muscle f...