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A commercial fisheries production function : the Skeena River sockey salmon gillnet fishery Roberts, Richard Frederick Anthony

Abstract

The production functions commonly suggested in the fishery bio-economic literature are reviewed, and modifications are suggested to take into account direct and indirect gear externalities and gear saturation effects in a salmon gillnet fishery. This suggests a daily production function of the Cobb-Douglas variety, tested on Skeena River sockeye salmon data. Using the daily production function, a seasonal model is developed, which reflects the intra-seasonal peaking nature of the run, and the multiple day stock removal effect. The properties of this function are analysed, and to demonstrate the significance of the function, its shape is used to indicate the direction of bias in the Crutchfield and Pontecorvo estimates of dissipated rent in Bristol Bay and Puget Sound.

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