Self-Regulation of the Okanagan Lake Kokanee Recreational Fishery: Dynamic Angler Effort Response to Varying Fish Abundance and Productivity

Autor: N. T. Johnston, Paul J. Askey
Rok vydání: 2013
Předmět:
Zdroj: North American Journal of Fisheries Management. 33:926-939
ISSN: 1548-8675
0275-5947
DOI: 10.1080/02755947.2013.818082
Popis: The fishery for kokanee Oncorhynchus nerka in Okanagan Lake, British Columbia, exemplifies three common issues in the management of recreational fisheries: time-varying stock–recruit parameters, mixed stocks within a single fishing area, and open-access fishing effort. The aggregate kokanee stock (consisting of stream-spawning and shore-spawning stocks) declined 50-fold between 1971 and 1998 and then partially recovered in the most recent decade. This contrast in fish abundance provides an opportunity to gain insights into the predator–prey dynamics of anglers and fish in an open-access sport fishery. Structural variations in the Ricker stock–recruit function were fitted to the time series of spawner escapements and fishery data to estimate the relative role of nonstationary stock–recruit parameters versus angler harvest in the observed time series. The optimal model structures selected by Akaike's information criterion suggested that kokanee dynamics were driven by external factors (e.g., lake n...
Databáze: OpenAIRE
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