Cover Image
close this bookA short review of precautionary reference points and some proposals for their use in data-poor situations (1998)
View the document(introduction...)
View the documentIntroduction
View the documentSome General Considerations
View the documentThe Role of RPs and Harvest Laws in Management
View the documentObjectives Underlying Formulation of Management and Reference Points
View the documentA Brief Classification of LRPs and their Applicability in Information-limited Situations
View the documentFunctioning of an LRP-based System
View the documentSpecific Problems and Approaches for Tuna Fisheries
View the documentReference Points from Size-and-age Data?
View the documentDiagnosis of Areas Where LRPs are Required
View the documentMultispecies RPs?
View the documentSpatial Information and Reference Points
View the documentRotating Closures and Gauntlet Models
View the documentDiscussion
View the documentReferences
View the documentAnnex: Alternative Closed-form Solution for FNOW

Multispecies RPs?

Both ICES and NAFO have had difficulties in deciding on how to set RPs in multispecies fisheries, and this is a major problem, given the multispecies nature of most of their fisheries. Some conclusions seem to emerge from this process, however:

Multispecies reference points which take into account impacts of the fishery not only on the target species but on its by catch-species, predators, prey and competitors, would normally have to be more conservative than if the target stock is considered alone. This is not only because there is a need under the Biodiversity Convention and UN Agreement to maintain self-sustaining stocks of all species concerned (including incidental captures) but because some of them (e.g. dolphins) probably require lower RPs in terms of fishing mortality than the target species. For most oceanic tunas, the prey species are rarely heavily exploited and predators are not well defined, so this problem seems somewhat simpler than for demersal fish assemblages, a situation that is far from the case for shelf fisheries.

Comparable considerations would seem to apply for shelf fisheries, and multi-species RPs could be derived from ecological/food web models.