Routine and post-exercise metabolic rates were measured for juvenile rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis infected with the microsporidium gill parasite Loma salmonae under laboratory conditions. Rainbow trout increased routine and post-exercise metabolic rate in response to infection compared with controls. Brook trout, on the other hand, lowered routine meta...

This minireview summarizes the present state of knowledge concerning the importance of yeasts in fish gut. Yeasts have been commonly isolated in the gastrointestinal tract, and high population densities were sometimes noted in healthy fish, but the data were quite variable in terms of colony counts and taxonomical diversity. Rhodotorula sp. seemed relatively frequent in both marine and freshwat...

Rainbow trout (Oncorhynchus mykiss) were exposed to 1.5 and 15% v/v secondary treated sewage effluent for 32 weeks in flow-through mesocosms. The exposure encompassed the full period of reproductive development for rainbow trout. Trout did not show any evidence of a dose-dependent change in growth. Fish exposed to 15% effluent were the only group to show mortality (5%) over the duration of the ...

A role for acid-sensing ion channels (ASICs) to serve as epithelial channels for Na(+) uptake by the gill of freshwater rainbow trout was investigated. We found that the ASIC inhibitors 4',6-diamidino-2-phenylindole and diminazene decreased Na(+) uptake in adult rainbow trout in a dose-dependent manner, with IC50 values of 0.12 and 0.96 μM, respectively. Furthermore, we cloned the trout ASIC1 a...

Hybridization creates novel gene combinations that may generate important evolutionary novelty, but may also reduce existing adaptation by interrupting inherent biological processes, such as genotype-environment interactions. Hybridization often causes substantial change in patterns of gene expression, which, in turn, may cause phenotypic change. Rainbow trout (Oncorhynchus mykiss) and cutthroa...

The aim of this study was to investigate the effect of red pepper (Capsicum annuum) extract on growth, blood, biochemical and non-specific immune parameters of 360 rainbow trout (Oncorhynchus mykiss) juveniles with average weight of 9.38±0.01 g. The fish were fed with a commercial diet containing 0, 0.25, 0.5 and 1% of C. annuum extract in 12 tanks (300L) with three replicates (30 fish per tank...

The effects of injectable Tunceli garlic oil (Allium tuncelianum) on serum response rainbow trout were examined. Influence intraperitoneal (i.p.) injection administration (TGO) was evaluated some immunological factors trout. Fish weight 40 g i.p. injected TGO at doses 1% and 10%. Serum lysozyme activity, bactericidal myeloperoxidase, protein immunoglobulin levels measured days 3, 7, 14 21 after...

—Comparisons of strontium:calcium (Sr:Ca) ratios in otolith primordia and freshwater growth regions were used to identify the progeny of steelhead Oncorhynchus mykiss (anadromous rainbow trout) and resident rainbow trout in the Deschutes River, Oregon. We cultured progeny of known adult steelhead and resident rainbow trout to confirm the relationship between Sr:Ca ratios in otolith primordia an...

Brown, J. Anne, Richard K. Paley, Shehla Amer, and Stephen J. Aves. Evidence for an intrarenal renin-angiotensin system in the rainbow trout, Oncorhynchus mykiss. Am J Physiol Regulatory Integrative Comp Physiol 278: R1685– R1691, 2000.—Physiological and molecular approaches were used to investigate the existence of an intrarenal reninangiotensin system (RAS) in rainbow trout. Inhibition of ang...