Optimal Fishing Mortalities with Age-Structured Bioeconomic Model - A Case of NEA Mackerel

26 Pages Posted: 13 Jun 2016

See all articles by Yuanming Ni

Yuanming Ni

Norwegian School of Economics (NHH) - Department of Business and Management Science

Stein Ivar Steinshamn

Norwegian School of Economics (NHH) - Department of Business and Management Science

Date Written: May 31, 2016

Abstract

The effects of random environmental impacts on optimal exploitation of a fish population are investigated using both optimization and simulation, based on a discrete-time age-structured bioeconomic model. The optimization problem is solved as a non-linear programming problem in GAMS. First, a basic model structure and 6 different scenarios, dealing with two interactions between fish and environment, are introduced. Based on the simplest scenario, eight different parameter combinations are tested. Then the optimization problem is solved for each of the 6 scenarios for a period of 100 years in order to gain long term insights. The main finding is that higher volatility from the environment leads to higher net profits but together with a lower probability of actually hitting the mean values. Simulations are conducted with different fixed fishing mortality levels under 6 scenarios. It seems that a constant fishing mortality around 0.06 is optimal. In the end, a comparison is made between historical and optimal harvest for a period of 40 years. It turns out that in more than 70% of the time, the optimal exploitation offered by our optimization model dominates the historical one, leading to 43% higher net profit and 34% lower fishing cost on average.

Keywords: Random environmental impacts, optimal exploitation, non-linear programming

JEL Classification: C61, Q00, Q20, Q22, Q50

Suggested Citation

Ni, Yuanming and Steinshamn, Stein Ivar, Optimal Fishing Mortalities with Age-Structured Bioeconomic Model - A Case of NEA Mackerel (May 31, 2016). NHH Dept. of Business and Management Science Discussion Paper No. 2016/9, Available at SSRN: https://ssrn.com/abstract=2791493 or http://dx.doi.org/10.2139/ssrn.2791493

Yuanming Ni (Contact Author)

Norwegian School of Economics (NHH) - Department of Business and Management Science ( email )

Helleveien 30
Bergen, NO-5045
Norway

Stein Ivar Steinshamn

Norwegian School of Economics (NHH) - Department of Business and Management Science ( email )

Helleveien 30
Bergen, NO-5045
Norway

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