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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on March 5, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(4):560-570; doi:10.1093/icesjms/fsn015
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Biology of the skates Bathyraja brachyurops and B. griseocauda in waters around the Falkland Islands, Southwest Atlantic

Alexander I. Arkhipkin, Nina Baumgartner, Paul Brickle, Vladimir V. Laptikhovsky, Joost H. W. Pompert and Zhanna N. Shcherbich

Fisheries Department, Falkland Islands Government, PO Box 598, Stanley, Falkland Islands

Correspondence to A. I. Arkhipkin: tel: +500 27260; fax: +500 27265; e-mail: aarkhipkin{at}fisheries.gov.fk

Arkhipkin, A. I., Baumgartner, N., Brickle, P., Laptikhovsky, V. V., Pompert, J. H. W., and Shcherbich, Z. N. 2008. Biology of the skates Bathyraja brachyurops and B. griseocauda in waters around the Falkland Islands, Southwest Atlantic. – ICES Journal of Marine Science, 65: 560–570.

The distributions and length compositions of two large, abundant skates, broadnose skate Bathyraja brachyurops and grey-tail skate B. griseocauda, were studied using an extensive dataset (~48 000 skates) collected from the commercial fishery and research cruises on the southeastern Patagonian Shelf around the Falkland Islands between 1992 and 2006. Bathyraja brachyurops mostly inhabit the shelf at depths shallower than 250 m, whereas B. griseocauda are found deeper (>250 m), off the shelf break and slope. Small individuals of both species are most segregated spatially. Growth increments on caudal thorns and vertebral centra revealed that B. brachyurops grow slower and have a shorter lifespan, attaining a maximum total length of 125 cm at 20 years, compared with B. griseocauda (~150 cm at 28 years). Maturity is attained at 8–10 years for male and female B. brachyurops, and at 15 and 17 years for B. griseocauda, respectively. Spawning takes place on spatially segregated spawning grounds, B. brachyurops reproducing above the shelf break, and B. griseocauda just below the shelf break throughout the year, with a smaller proportion of females of both species laying eggs in winter.

Keywords: age, Bathyraja brachyurops, Bathyraja griseocauda, reproduction, skate

Received 3 July 2007; accepted 16 January 2008; advance access publication 5 March 2008.


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