Nursery areas and recruitment variation of Northeast Atlantic mackerel (Scomber scombrus)
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AuthorsJansen, T. (Teunis); Kristensen, K. (Kasper); van der Kooij, J. (Jeroen); Post, S. (Søren); Campbell, A. (Andrew); Utne, K.R. (Kjell Rong); Carrera-López, P. (Pablo); Jacobsen, J.A. (Jan Arge); Gudmundssdottir, A. (Asta); Roel, B. A. (Beatriz); Hatfield, E.M.C. (Emma)
demersal trawl survey
There are currently no dedicated recruitment survey data available in support of the assessment of the abundance and distribution of Northeast Atlantic (NEA) mackerel (Scomber scombrus), one of the most widespread and commercially important fish stocks in the North Atlantic. This is despite the fact that an estimate of recruitment is an important requirement for the provision of advice to fishery managers. The work here addresses this by compiling catch rates of juvenile mackerel from bottom-trawl surveys conducted between October and March during 1998–2012 and applying a log Gaussian Cox (LGC) process geostatistical model incorporating spatio-temporal correlations. A statistically significant correlation between the modelled catch rates in adjacent quarters 4 and 1 (Q4 and Q1) demonstrates that bottom-trawl surveys in winter are an appropriate platform for sampling juvenile mackerel, and that the LCG model is successful in extracting a population abundance signal fromthe data. ...
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