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...

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...

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...

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...

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...

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, ...

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...

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...