Biology of the brown trout (Salmo trutta L.) in French rivers
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ABSTRACT ABSTRACT Weight-length relationships provide a tool to assess the body condition of brown trout (Salmo trutta) populations inhabiting stream reaches where stressors, such as metals, have chronic, sub-lethal toxic impacts. A previously published brown trout standard-weight equation, Ws, overestimated Colorado brown trout weights. Weight-length data from 16 Colorado brown trout populations (n = 9, 8 16) were used to develop a regional standard weight (Wcl) equation based on fish from waters free of metal contamination. Relative-weights (Wr) were then compared between metal-contaminated and metal-free streams in Colorado using the Wcl equation. Brown trout Wr's were lower in metal contaminated streams than in stream reaches uncontaminated by metals. The development and use of regional standard weight equations is recommended to help assess the weight of brown trout inhabiting metal-contaminated stream reaches.
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This study analysed the influence of temperature and other environmental factors on the growth of brown trout Salmo trutta YOY in Europe. Air temperature accounted for the greatest proportion of the variance in maximum total length, but the inclusion of other factors significantly increased the proportion of the variance explained.
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A method is described for the amplification and restriction digestion of two variable regions of mitochondrial DNA (mtDNA) in the brown trout ( Salmo trutta ) as a non‐invasive sampling and rapid screening technique for measuring genetic variation in populations.
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Summary The recapture of tagged brown trout (Salmo trutta L.) in two experimental streams gave over 60% recapture in the section of stream where they were released, and over 80% when adjacent areas were included. Operation of a downstream trap showed that there was little emigration from the area above the trap and it is concluded that most of the fish which disappear die.
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The fishPy tool is a three-dimensional, spatially-continuous, individual-based model of fish responses to hydraulic stimuli during upstream migration through ecohydraulic environments.
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