The phylogeny of salmonid fishes has been the focus of intensive study for many years, but some of the most important relationships within this group remain unclear. We used 269 Genbank sequences of mitochondrial DNA (from 16 genes) and nuclear DNA (from nine genes) to infer phylogenies for 30 species of salmonids. We used maximum parsimony and maximum likelihood to analyze each gene separately...

Westslope cutthroat trout (Oncorhynchus clarki lewisi, WCT) and introduced rainbow trout (O. mykiss, RBT) readily hybridize and introgression has occurred in many drainages across the historic native range of WCT. In British Columbia (Canada), the upper Kootenay River drainage is the heart of the WCT distribution and is thought to harbour native gene pools, but many population are thought to be...

This is the first direct physiological evidence in support of the ionoregulatory hypothesis, challenging the long-held assumption that teleost gills develop initially for gas exchange. Resting unidirectional sodium (Na(+)) uptake and oxygen (O(2)) uptake across the skin and gills were measured simultaneously in larval rainbow trout, Oncorhynchus mykiss, during development. In soft and hard wate...

background & aim: continuous use of antibiotics leads to drug resistance and thereby to a reduced efficacy of the drugs. antibiotics accumulate in the environment and fish pose a potential risk to consumers and to the environment.increased public awareness of the negative effects caused by overexposure to synthetic chemicals has led to the search for ‘‘green drugs’’, such as organic and syn...

We quantified and modeled the 96-h toxicity of commercially available injectable erythromycin, Erythro-200, to Atlantic salmon (Salmo salar), cutthroat trout (Oncorhynchus clarki), rainbow trout (O. mykiss) and spring chinook salmon (O. tshawytscha) in several trials to analyze the response within and across different temperatures and ages (sizes) of fish. Probit analyses of the dose response a...