Ultrastructural studies on experimentally induced vitellogenesis in juvenile rainbow trout (Salmo gairdneri R.)

Tetraploidy induced by heat shocks in the rainbow trout (Salmo gairdneri R.).

In this study, I attempted to induce tetraploidy in the rainbow trout by means of 28 degrees C-heat shocks applied to fertilized eggs. Variations in the parameters of treatment resulted in large differences in survival rates between the batches, and varying proportions of tetraploid, diplotetraploid and diploid embryos were obtained with shocks beginning between 6 h 30 min and 9 h after fertili...

Testicular feed back on the hypothalamo - pituitary axis in rainbow trout ( Salmo gairdneri R . )

A testicular feed back on the hypothalamo-pituitary system was studied in male rainbow trout (Salmo gairdneri) after bilateral castration and steroid or testicular supplementation. Experiments were carried out at various periods of the spermatogenetic cycle ; in March-April (resting stage), June (initiation of spermatogenesis), October (end of spermatogenesis and before spermiation), and Decemb...

Nocardial Infection in Hatchery-reared Fingerling Rainbow Trout (salmo Gairdneri).

Toxicokinetics of Fenvalerate in Rainbow Trout (Salmo Gairdneri)

An in vivo rainbow trout (Salmo gairdneri) preparation was used to evaluate the gill uptake and toxicokinetics of [3H]fenvalerate ([R,S]-α-cyano-3-phenoxybenzyl [R,S]-2-[4-chloro-phenyl]-3-methylbutyrate), a synthetic pyrethroid insecticide. Fish were exposed to technical-grade fenvalerate (0.28 or 23 ng/L) or an emulsifiable-concentrate formulation (16 ng/L) for 36 to 48 h. No significant effe...

Lactate and Proton Dynamics in the Rainbow Trout (salmo Gairdneri)

Chronically cannulated rainbow trout were subjected to 6 min of severe burst exercise and monitored over a 12 h recovery period. There were shortlived increases in haematocrit, haemoglobin, plasma protein, Na and Cl~ levels. Plasma [Cl~] later declined below normal as organic anions accumulated. A much larger and more prolonged elevation in plasma [K] probably resulted from intracellular acidos...