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Stock discrimination of horse mackerel (Trachurus trachurus) in the Northeast Atlantic and Mediterranean Sea: integrating the results from different stock identification approaches

Abaunza, Pablo; Murta, A.; Mattiucci, S.; Cimmaruta, R.; Nascetti, G.; Magoulas, A.; Sanjuan, A.; Comesaña, S.; MacKenzie, K.; Molloy, John; Santos, A.T.; Iversen, Svein A.; Dahle, Geir; Gordo, L.; Stransky, Christoph; Zimmermann, Christopher; Santamaria, M.T.; Ramos, P.; Quinta, R.; Pinto, A.L.; Ruggi, A.; Campbell, Neil
Working paper
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CM_2004_EE_19.pdf (338.9Kb)
URI
http://hdl.handle.net/11250/106583
Date
2004
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the General Secretary  
Abstract
The goal of horse mackerel stock discrimination was tackled by integrating both established

and innovative approaches such as genetic markers (allozymes, mtDNA, microsatellite

DNA and SSCP), morphometry and parasites, tagging experiments and life history traits

(growth, reproduction and distribution), within the EU-funded HOMSIR project. The

sampling covered almost the whole distribution range of horse mackerel through 20

sampling localities. 200 fish per sampling site were collected taking in consideration the

spawning season and temporal variation (two years of sampling). The results from genetic

approaches (Multilocus Allozyme Electrophoresis, mtDNA and microsatellite DNA)

showed that there was only slight genetic differentiation among sampling sites. Another

genetic technique (SSCP), was successful in finding a genetic marker that demonstrated

substructuring in horse mackerel populations. Several approaches (SSCP, morphometrics,

parasites) support the separation between the Atlantic Ocean and the Mediterranean Sea in

horse mackerel populations, although the most western Mediterranean area could also be

connected with the Atlantic populations. In the Northeast Atlantic, various stocks can be

distinguished: The west Atlantic coast of the Iberian Peninsula (southern stock); the west

coasts of European countries from northern Spain to Norway (western stock) and the North

Sea stock. This information implies the revision of the boundaries of the so-called southern

and western stocks as currently defined. Various results suggested that adult horse mackerel

could migrate through different areas/or stocks in the Northeast Atlantic. Horse mackerel

from the Mauritanian coast is distinguished by its high production parameters (growth and

batch fecundity). The population of horse mackerel in the Mediterranean Sea is substructured

roughly in at least three main areas: western, central and eastern Mediterranean.

In this contribution, we try to integrate the fundamental findings of differente approaches

showing that the holistic approach is the appropriate way to identify stocks in horse

mackerel.
Publisher
ICES
Series
ICES CM Documents;2004/EE:19

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