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Understanding intraspecific variability in fish somatic growth rates is important asgrowth is a key life history trait that plays a fundamental role in many biological andecological processes. Here, the influence of environmental and chemical parameters wastested on intraspecific variability in growth rates of the cyprinid fishes roachRutilus rutilus, chub Squalius cephalus and daceLeuciscus leuciscus across 13 rivers in England, and also compared withthose for barbel Barbus barbus from the same rivers. Outputs indicatedthat growth rate responses to the parameters were species-specific, with more significanteffects generally detected on juvenile growth than lifetime growth. For R. rutilusand S. cephalus, latitude (as asurrogate of temperature) was the most significant predictor of their growth rates, withgrowth rates decreasing as latitude increased. Contrary to prediction, aspects of degradedwater quality accelerated the growth rates of these fishes, except in B. barbus,although concentrations of nitrogenous compounds were below toxicity thresholds. Thisemphasizes the ability of populations of these cyprinid fishes to tolerate someenvironmental disturbances and, in entirety, suggests that the intraspecific variabilityin the growth rates of these fishes is significantly influenced by abiotic parameters andtheir association with levels of anthropogenic disturbance

Influences of environmental and chemical parameters on the spatial growth patterns of four riverine cyprinid fishes