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Periodical article Periodical article Leiden University catalogue Leiden University catalogue WorldCat catalogue WorldCat
Title:A bio-economic model for Namibian pilchard
Authors:Sandal, L.K.ISNI
Steinshamn, S.I.
Periodical:South African Journal of Economics
Geographic term:Namibia
Subjects:economic theories
External link:https://onlinelibrary.wiley.com/doi/10.1111/j.1813-6982.2001.tb00014.x/pdf
Abstract:This paper presents economic and biological data from the pilchard fishery in Namibia in order to develop optimal harvest paths. The method used was optimal control theory, but instead of solving for the steady state, the co-state variable has been eliminated which has allowed the optimal harvest to be found as a feedback control law, that is as a pure function of the stock. This has provided a stepwise harvest function which is due to the specific demand function for pilchard, consisting partly of demand for canning and partly of demand for fishmeal. The function suggests a harvest moratorium for stock levels below 500,000 tonnes and a gradual build-up to an optimal steady state at a stock size of about two million tonnes, with a harvest rate of 450,000 tonnes. Bibliogr., notes.