Nursery areas and recruitment variation of Northeast Atlantic mackerel (Scomber scombrus)

ICES Journal of Marine Science - Tập 72 Số 6 - Trang 1779-1789 - 2015
Teunis Jansen1,2, Kasper Kristensen1, Jeroen van der Kooij3, Søren Post2, Andrew C. Campbell4, Kjell Rong Utne5, Pablo Carrera6, Jan Arge Jacobsen7, Asta Gudmundssdottir8, Beatriz Roel3, Emma Hatfield9
1DTU AQUA—National Institute of Aquatic Resources, Charlottenlund, Denmark
2GINR—Greenland Institute of Natural Resources, Nuuk, Greenland
3CEFAS—Centre for Environment, Fisheries and Aquaculture Science, Lowestoft NR33 0HT, UK
4Fisheries Ecosystems Advisory Services, Marine Institute, Galway, Ireland
5Institute of Marine Research, Nordnesgt 33, 5005 Bergen, Norway
6Instituto Español de Oceanografía, Avenada de Brasil 31, E-28020 Madrid, Spain
7FAMRI—Faroe Marine Research Institute, Tórshavn, Faroe Islands
8MRI—Marine Research Institute, PO Box 1390, Skulagata 4, 121 Reykjavik, Iceland
9Marine Scotland Science, 375 Victoria Road, Aberdeen AB11 9DB, UK

Tóm tắt

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 from the data. In this regard, the model performed appreciably better than a more commonly used raising algorithm based on survey swept-area estimates. Therefore, the LCG model was expanded to include data from the entire survey time-series, and a recruitment index was developed for use in the annual ICES stock assessment. We hypothesize that catchability is positively density-dependant and provides supporting evidence from acoustic observations. Various density-dependant transformations of the modelled catch rates were furthermore found to improve the correlation between the derived annual recruitment index and recruitment estimated by backcalculation of adult mackerel data. Square root transformation led to the strongest correlation, so this is recommended for further analysis of mackerel abundance. Finally, we provide maps of spatial distributions, showing that the most important nursery areas are around Ireland, north and west of Scotland, in the northern North Sea north of 59°N and, to some extent, also in the Bay of Biscay.

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ICES Journal of Marine Science

Tập 72 Số 6

1779-1789

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