Nursery areas and recruitment variation of Northeast Atlantic mackerel (Scomber scombrus)
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Jansen, T. (Teunis); Kristensen, K. (Kasper); van der Kooij, J. (Jeroen); Post, S. (Søren); Campbell, A. (Andrew); Utne, K.R. (Kjell Rong); Carrera, P. (Pablo); Jacobsen, J.A. (Jan Arge); Gudmundsdóttir, A. (Asta); Roel, B.A. (Beatriz Adelaida); Hatfield, E.M.C. (Emma)Date
2014-10-03Type
research articleKeywords
acousticCantabrian Sea
Catchability
demersal trawl survey
geostatistics
LGC
mackerel
Northeast Atlantic
North Sea
recruitment
Scomber scombrus
stock assessment
Abstract
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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