Discussion Papers,
Norwegian School of Economics, Department of Business and Management Science

Abstract: More and more fishery researchers begin to acknowledge that one-dimensional biomass models may omit key information when generating management guidelines. For the more complicated age-structured models, numerous parameters require a proper estimation or a reasonable assumption. In this paper, the effects of recruitment patterns and environmental impacts on the optimal exploitation of a fish population are investigated. Based on a discrete-time age-structured bioeconomic model of Northeast Atlantic mackerel, we introduce the mechanisms that generate 6 scenarios of the problem. Using the simplest scenario, optimizations are conducted under 8 different parameter combinations. Then, the problem is solved for each scenario and simulations are conducted with constant fishing mortalities. It is found that a higher environmental volatility leads to more net profits but with a lower probability of achieving the mean values. Any parameter combination that favours the older fish tends to lend itself to pulse fishing pattern. The simulations indicate that a constant fishing mortality around 0.06 performs the best. A comparison between the optimal and the historical harvest shows that for more than 70% of the time, the optimal exploitation precedes the historical one, leading to 43% higher net profit and 34% lower fishing cost.

Keywords: Age-structured; bioeconomic; recruitment; optimization

JEL-codes: C44; C61; Q00; Q20; Q22; Q50

24 pages, September 3, 2019

Full text files

2612461  Full text

Download statistics

• Norwegian School of Economics, Department of Business and Management Science
• Ordering Working Papers
• Home page for this series

Questions (including download problems) about the papers in this series should be directed to Stein Fossen ()
Report other problems with accessing this service to Sune Karlsson ().

RePEc:hhs:nhhfms:2019_004This page generated on 2024-09-13 22:16:23.