Southern Hemisphere porbeagle shark (Lamna nasus) stock status assessment x

In recent years strong conservation and management actions have been taken for porbeagle sharks, mainly on the basis of evidence available for the Northern Hemisphere population in the Atlantic. The species as a whole was listed on the Convention on the Conservation of Migratory Species (CMS) in 2008 and on the Convention on International Trade in Endangered Species (CITES) Appendix II as of 2014. However, the status of the Southern Hemisphere stock has remained poorly understood in part because of the dispersed, circumpolar extent of its range and the absence of a mechanism to coordinate an assessment. This study attempts to assess the status of the Southern Hemisphere population of porbeagle shark (Lamna nasus) for the first time.
This study was conducted under the auspices of the Western and Central Pacific Fisheries Commission (WCPFC) and the Commission for the Conservation of Southern Bluefin Tuna (CCSBT) with funding from the Common Oceans (ABNJ) Tuna Project. The key data holders, which were identified as Argentina, Chile, Japan, New Zealand and Uruguay, had not previously collaborated on a stock status assessment and are not all members of WCPFC or CCSBT. As a result, rather than centrally compiling the data into a single dataset, this study was designed so that the consultant worked with each data holder to produce stock status indicators, and those indicators provided input to and context for a model-based assessment framework. Onsite analysis was undertaken in three of the five countries and webinars were used to share information amongst the study participants.
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