The effect of hypoxia and anaemia on the swimming performaance of rainbow trout (Salmo gairdneri).

Oxygen Consumption and Swimming Performance in Hypoxia-acclimated Rainbow Trout Salmo Gairdneri

1. Swimming performance and oxygen consumption of normoxic (control) and hypoxia-acclimated (P02 — 40mmHg) rainbow trout, Salmo gairdneri Richardson, were monitored at >145, 60 and 40mmHg. 2. Maximum swimming velocity at 40mmHg was reduced from >54-8cms"' to 41-4cms" in controls and to 40-6cms" in hypoxiaacclimated fish. 3. Normoxic oxygen consumption of control fish ranged from Q-T-SmgOzkg-'h(...

The effect of changes in blood oxygen-carrying capacity on ventilation volume in the rainbow trout (Salmo gairdneri).

1. Changes in ventilation volume (Vg) of rainbow trout caused by hypercapnia, hypoxia and anaemia were measured directly by collection of expired water. 2. Exposure to hypercapnic water (PCO2 range 0.5-2 kPa) increased Vg (by up to four times) by augmenting ventilatory stroke volume; breathing frequency remained constant. O2 added to the inspired water in maintained hypercapnia reduced Vg at al...

Free and Total Calcium Concentrations in the Blood of Rainbow Trout, Salmo Gairdneri, during 'stress' Conditions

Measurements were made of the free and total calcium concentrations ([Ca] and Cat), acid-base status, haemoglobin concentration, haematocrit and plasma protein concentration in the blood of the rainbow trout, Salmo gairdneri. In isolated blood, [Ca] was proportional to Cat while log[Ca] was inversely proportional to pH. Similar findings have been reported from human blood. During intense activi...

Responses of the respiratory pumps to hypoxia in the rainbow trout (Salmo gairdneri).

The Scaling of Aerobic and Anaerobic Muscle Power in Rainbow Trout (salmo Gairdneri)

The scaling of anaerobic metabolism and red muscle mass was examined in rainbow trout (Salmo gairdneri) ranging in size from 2 to 1200 g. The initial rate of white muscle lactate production during maximal burst activity was significantly higher in large (28-1 cm) than in small (8-0 cm) fish. 'Resting' lactate concentrations in anesthetized trout (approximately 30 s of stress) increased with fis...