Western and Central Pacific Fisheries Commission

Abstract

This paper aims to review and recommend appropriate limit reference points (LRPs) for WCPFC elasmobranchs taking into consideration the WCPFC’s LRP framework for target species. It provides a conceptual framework for selecting appropriate LRPs for relatively data-poor and under-studied elasmobranch populations while allowing the WCPFC debate on the theoretical advantages and disadvantages of various LRPs to continue. Three broad types of LRPs are defined: i) estimated LRPs which are derived from population models; ii) empirical LRPs that can be directly observed in the field; and iii) risk-based LRPs based on life history parameters alone. After considering a number of expert reviews, and the application of LRPs to sharks and rays in fisheries around the world, this paper recommends a paired (pressure-state) and tiered (based on availability of information) framework similar to that adopted for target species. For those elasmobranchs evaluated using a stock assessment model, a fishing mortality-based LRP of FMSY is recommended on the basis that it is appropriately conservative and commonly applied as a best practice LRP. However, in cases where the stock-recruitment relationship is highly uncertain, it is recommended that Fcurrent also be compared to an SPR-based LRP such as F60%SPR,unfished so that the WCPFC Scientific Committee can decided on a case-by-case basis whic