Joint management of marine mammals and a fish species: The case of cod and grey seals in the Nordic‐Baltic Sea countries. (28th February 2022)

• Record Type: Journal Article
• Authors: Blomquist, Johan; Jensen, Frank; Waldo, Staffan; Flaaten, Ola; Holma, Maija K.
• Other Names: Schenk Hanna guestEditor.; Meier Felix guestEditor.; Quaas Martin guestEditor.
• Is Part Of: Natural resource modelling. Volume 35:Number 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-28
• Subjects: cod -- grey seals -- joint management -- Nordic‐Baltic Sea Countries; Conservation of natural resources -- Mathematical models -- Periodicals; Ecology -- Mathematical models -- Periodicals; 371.397
• DOI: 10.1111/nrm.12341
• Languages: English
• ISSNs: 0890-8575

Abstract

Abstract: In this paper, we present a simple theoretical, steady‐state equilibrium, predator‐prey model for the joint management of marine mammals and a fish species. As an empirical case, we choose cod and grey seals in the Nordic‐Baltic Sea countries, and several benefits and costs related to the latter are considered. We show that the optimal grey seal population is much lower than the actual population, and this result is robust to variations in relevant parameter values. This result can be explained by the fact that the profit from harvesting cod is much higher than the net benefits from grey seals. Recommendations for Resource Managers: Consider the implications of joint management of a fish species and grey seals. Consider benefits and costs related to grey seals. Consider the implications of benefits and costs related to grey seals for the harvest and population of grey seals in Nordic‐Baltic Sea countries. Consider the implications of benefits and costs related to grey seals for the harvest and stock size of cod in Nordic‐Baltic Sea countries.