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

Master

Humans are increasingly affecting the sustainability of fisheries by way of fishing-induced selection, leading to shifting gene frequencies and evolutionary changes. This thesis examines the potential effects of fishing-induced selection on the trait of vulnerability to angling in a recreational fishery. Field and laboratory experiments were carried out to determine the relationships between vulnerability to angling and metabolism, anaerobic capacity, life history, and energetics. Largemouth bass (Micropterus salmoides) selected for high vulnerability to angling (HVF) had higher metabolic rates and a broader metabolic scope, and they experienced more severe physiological disturbances following exhaustive exercise. Fish selected for low vulnerability to angling (LVF) demonstrated higher growth rates accompanied by a lower investment in gonadal development. While energy stores did not differ, HVF displayed higher levels of plasma magnesium, which is indicative of increased feeding. Overall, this research identifies novel associations between physiological and life-history traits and differential vulnerability to angling from the perspective of a recreational fishery.

Redpath, T. D. (2008). The effects of fishing-induced selection on physiological and life-history traits in Largemouth Bass (Micropterus salmoides): a recreational angling perspective. Master Thesis, Carleton University Ottawa, Ontario / Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB) in Berlin


Veröffentlicht : 2008
Erschienen in : Master Thesis, Carleton University Ottawa, Ontario / Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB) in Berlin