Strike Limit Algorithm Optimisation: A Realistic Example

• Main Author: Geof H. Givens
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2000
• Subjects: Butterworth; Chukchi
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.31.6012; http://www.stat.colostate.edu/~geof/documents/awmp99.b.ps

We illustrate a process for finding an improved variant of an aboriginal whaling management procedure strike limit algorithm (SLA), applying the merging and optimisation approach of Givens (1997; 1999a). A modified version of the SLA developed by Punt and Butterworth (1997) was chosen as the procedure to be optimised for management of the Bering-Chukchi-Beaufort Seas stock of bowhead whales. The optimisation considered functions of the quota and other outputs from the nominal SLA, along with outputs from two other SLAs and estimates of certain population dynamics parameters. The result reduced the Bayes risk by over 90%, compared to the nominal procedure, and improved simulated SLA performance by usually allowing more strikes at less depletion risk. Such results suggest that this approach may be attractive for development of wildlife management procedures in many other settings. INTRODUCTION International Whaling Commission (IWC) management of aboriginal subsistence whaling.