We have isolated and sequenced a clone from a rainbow trout (Salmo gairdneri) genomic library that carries a gene encoding a fish growth hormone (GH). This gene spans a region of approximately equal to 4 kilobases, nearly twice that of mammalian GH genes. The trout GH gene is comprised of six exons, in contrast with five exons in mammals. The additional intron in the fish gene interrupts transl...

The nucleotide sequence of rainbow trout (Salmo gairdneri) 5.8 S rRNA was determined to be (formula: see text). The major molecular species is 161 nucleotides long; the sequence differs in only eight nucleotides from that of Man. An estimate of the secondary structure retains essentially all of the features previously described in mammalian 5.8 S RNAs with several interesting variations. The ve...

Two commercial polychlorinated biphenyl mixtures (Aroclor 1254 and Aroclor 1242) and one polybrominated biphenyl mixture (FireMaster BP-6) were examined for their abilities to induce hepatic microsomal monooxygenation in rainbow trout (Salmo gairdneri). Pretreatment of rainbow trout with Aroclors 1254 and 1242 (150 mg/kg IP) resulted in an approximate 10-fold induction of arylhydrocarbon (benzo...

WOOD, C. M. 1975. A pharmacological analysis of the adrenergic and cholinergic mechanisms regulating branchial vascular resistance in the rainbow trout (Salmo gairdneri). Can. J. Zool. 53: 1569-1577. The adrenergic and cholinergic mechanisms regulating branchial vascular resistance in the trout have been studied using a whole gill preparation perfused at constant flow under approximately normal...

1. Patterns of carbon dioxide excretion were investigated in rainbow trout (Salmo gairdneri). 2. The loss of erythrocytic carbonic anhydrase caused by severe anaemia does not affect acid/base regulation or the ability of fish to excrete CO2. 3. Bicarbonate excretion across the saline-perfused gills of trout is significant even though residence time for the saline in the gills is only 1--3 s. CO...

Under oxygenated conditions, in vitro, the highly aerobic red cells of the rainbow trout (Salmo gairdneri) exhibit tight coupling between energy (i.e. nucleotide triphosphate, NTP)-consuming and NTP-producing metabolic activity, as shown by strict maintenance of red cell NTP:haemoglobin ratios. This coupling is maintained following adrenergic stimulation of oxygenated red cells when the increas...