Record mackerel stock
IMR scientists have given a record high abundance estimate of the Northeast Atlantic mackerel stock
Following an ecosystem survey in the Norwegian Sea and surrounding waters this summer, Institute of Marine Research scientists have given the Northeast Atlantic mackerel stock a record high abundance estimate.
The ecosystem survey in the Norwegian Sea and adjacent areas was performed in July and August 2013 by four vessels; two from Norway, and one each from Iceland and the Faroe Islands.
The total swept area estimate of Northeast Atlantic mackerel was 8.8 million tonnes. The geographical coverage was 3.2 million square kilometers in the Nordic Seas from the central part of the North Sea in the south to Bear Island in the north, and from the Norwegian coast in the east and to Irminger Sea in Greenland waters to the west.
The 2010 year class contributed to more than 20% in number followed by abundant 2006, 2007 and 2011-year classes around 15% each, respectively. The 2008 year class was also well represented in the catches, contributing with 12% of the total numbers.
A standardised pelagic trawl swept area method has been developed and used to estimate a swept area abundance estimate of mackerel in the Nordic Seas in recent years. The swept area estimate is one of three different abundance indices available. The scientific method of abundance on mackerel is not yet accepted and will be evaluated in ICES in February 2014.
The ultimate goal is to get accepted and use this combined swept area estimate as an absolute/relative abundance index of spawning stock biomass (SSB) and possibly recruitment index, on an annual basis in the assessment of NEA mackerel after the NEA mackerel benchmark in February 2014.
Images for this article - click to enlarge
Unless otherwise stated, all images copyright © Mercator Media 2014. This does not exclude the owner's assertion of copyright over the material.