Initial exploratory investigations of some simple candidate management procedures for southern Bluefin tuna.

Butterworth, Doug S; Miyagawa, Mitsuyo; Jacobs, Melissa

Initial exploratory investigations of some simple candidate management procedures for southern Bluefin tuna.

Report

2018

Abstract

Simple constant proportion and target based empirical candidate management procedures are applied to the basic grid operating model and a low recruitment robustness test for SBT . The first two approaches , DMM1 and DMM2 , respectively use CPUE index data only, while DMM3 ad ds gene tagging data to the DMM2 approach. The key results are that the DMM2 target based approach substantially outperforms the constant proportion DMM1 one in terms of smoothness of the TAC trajectories, and that (at least as far as investigations have b een possible to date) the addition of gene tagging data offers little improvement to depletion statistics in instances where low recruitment has occurred . Performance under DMM2 is unusually good, but this approach still needs to be subjected to the other robustness tests, and further attempts need to be made to seek more improvement in performance when gene tagging data are used.

Reference:

Collections

Reports

Full item page