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ICES Journal of Marine Science: Journal du Conseil 2005 62(8):1705-1710; doi:10.1016/j.icesjms.2005.05.013
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© 2005 International Council for the Exploration of the Sea

Estimation of mackerel (Scomber scombrus L., 1758) and horse mackerel (Trachurus trachurus L., 1758) daily egg production outside the standard ICES survey area

Leonie Dransfelda,*, Oonagh Dwaneb, John Molloya, Sarah Gallaghera and Dave G. Reidc

a Marine Institute Galway Technology Park, Parkmore, Galway, Ireland
b National University Galway, Ireland
c Marine Laboratory PO Box 101, Victoria Road, AB11 9DB Aberdeen, Scotland, UK

*Correspondence to L. Dransfeld: tel: +353 91 430700; fax: +353 91 730470. e-mail: leonie.dransfeld{at}marine.ie.

An experimental egg survey was carried out to assess whether there was significant spawning of mackerel and horse mackerel outside the area surveyed triennially by the international mackerel and horse mackerel standard egg survey. In all, 170 stations were sampled in May 2002 on the Porcupine, Rockall, and Hatton Banks, over the Rockall Trough, and in Faroese waters, with 38 control stations inside and 132 stations outside the standard survey area. There was some spawning of mackerel south and east of the Rockall Bank and southeast of the Faroe Bank, extending to west of the Scottish Shelf. Limited horse mackerel egg production was found west of the Rockall Bank and south of the Faroe Bank. The total mackerel and horse mackerel daily egg production estimated from samples collected in 2002 outside the standard survey area was low compared with the egg production estimated in adjacent waters just inside the standard area in the same year and during the international standard surveys in May and June of 2001. The results suggest that including the spawning activity of both species outside the standard survey area would not significantly contribute to the total estimated egg production.

Keywords: daily egg production, ichthyoplankton, offshore banks, Scomber scombrus, spawning-stock biomass, Trachurus trachurus

Received 11 November 2004; accepted 18 May 2005.


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