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Although the selective pressures of commercial fishing are well known, few studies have examined this phenomenon in recreational fisheries. This study used a population of largemouth bass (Micropterus salmoides) with lines bred for high (HVF) and low (LVF) vulnerability to angling that were previously established from artificial truncation selection experiments. The main objective was to evaluate if differential vulnerability to angling was correlated with physiological traits including metabolic rate, metabolic scope, anaerobic capacity, and biochemical response to exercise. Standard metabolic rate was 11% higher, and maximal metabolic rate was 16% higher for HVF compared to LVF, with a metabolic scope that was 20% higher for HVF. A similar proportion of this scope was utilized by both HVF and LVF during recovery. Although immediately following exhaustive exercise, muscle lactate concentrations were 44% higher for HVF compared to LVF, both groups had returned to control levels after 2 h of recovery. Anaerobic energy expenditure (in ATP equivalents) was also significantly higher for HVF, a finding that is consistent with the observation that during exercise, HVF exhibited bursting activity more frequently than LVF. Significant differences were not detected between HVF and LVF for tissue energy stores (e.g. ATP, PCr) or aerobic (e.g. CS, CCO) and anaerobic (e.g. LDH) enzyme activities. Although the inherent reasons behind differential vulnerability to angling are complex, selection for these opposing phenotypes also appears to selecting for a suite of physiological traits, including

The effects of fishing-induced selection on physiological and life-history traits in Largemouth bass (Micropterus salmoides): a recreational angling perspective