Journal Article

Lengths at maturity and conversion factors for skates (Rajidae) around the British Isles, with an analysis of data in the literature

Sophy R. McCully, Finlay Scott and Jim R. Ellis

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 69, issue 10, pages 1812-1822
Published in print December 2012 | ISSN: 1054-3139
Published online December 2012 | e-ISSN: 1095-9289 | DOI: https://dx.doi.org/10.1093/icesjms/fss150
Lengths at maturity and conversion factors for skates (Rajidae) around the British Isles, with an analysis of data in the literature

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McCully, S. R., Scott, F., and Ellis, J. R. 2012. Lengths at maturity and conversion factors for skates (Rajidae) around the British Isles, with an analysis of data in the literature. –ICES Journal of Marine Science, 69: 1812–1822.

Biological data on skates (Rajidae) from around the British Isles were collected between 1992 and 2010. The relationship between total length and weight for nine species (Amblyraja radiata, Dipturus batis-complex, Leucoraja fullonica, L. naevus, Raja brachyura, R. clavata, R. microocellata, R. montagui, and R. undulata) are provided for each sex and ICES ecoregion (when significantly different). Conversion factors for disc width to total length are provided. The lengths at first maturity and of the largest immature skates are reported for each sex, and the lengths at 50% maturity are estimated. Spatial differences in the length at maturity of R. clavata (females only) and L. naevus (both sexes) were observed. The lengths at maturity are discussed in relation to the results of earlier studies, and methodological differences are considered to have influenced reputed decreases in the length at maturity. A more standardized approach to collecting and reporting maturity information is required if potential spatial differences and temporal changes are to be investigated.

Keywords: Batoidea; length–weight; life history; Rajiformes; reproductive biology

Journal Article.  7366 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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