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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on October 24, 2006
ICES Journal of Marine Science: Journal du Conseil 2007 64(1):131-140; doi:10.1093/icesjms/fsl004
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© 2006 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Reproduction of the angular angel shark (Squatina guggenheim): geographic differences, reproductive cycle, and sexual dimorphism

Jorge H. Colonello1, Luis O. Lucifora2 and Ana M. Massa3

1 Consejo Nacional de Investigaciones Científicas y Técnicas and Instituto Nacional de Investigación y Desarrollo Pesquero, Paseo Victoria Ocampo s/n, Mar del Plata B7602HSA, Argentina
2 Dalhousie University, Department of Biology, 1355 Oxford Street, Halifax, Canada, NS B3H 4J1
3 Instituto Nacional de Investigación y Desarrollo Pesquero, Mar del Plata B7602HSA, Argentina

Correspondence to L. O. Lucifora: tel: +1 902 4942146; fax: +1 902 4943736; e-mail: luis.lucifora{at}dal.ca

Colonello, J. H., Lucifora, L. O., and Massa, A. M. 2007. Reproduction of the angular angel shark (Squatina guggenheim): geographic differences, reproductive cycle, and sexual dimorphism. – ICES Journal of Marine Science, 64: 131–140.

The reproductive ecology of Squatina guggenheim from two coastal areas in South America is analysed. In both sexes, individuals from ER (El Rincón coastal system, the more southern area) attained a larger maximum total length (LT) and a heavier weight at a given length than those from LP (La Plata River estuary). Females from ER mature at a significantly larger LT than females from LP. These patterns could be explained by an advantage of larger body size at higher latitudes in providing more reserves for winter, because individuals from ER have a larger liver than those from LP. Spines in the outer part of the pectoral fins were observed only in adult males. Fecundity increased with female total length. Females have a 3-y reproductive cycle, consisting of 10–12 months of gestation and 2 y of oocyte maturation. The embryonic growth fits the Gompertz model. Birth is in November or December, as inferred from embryo size and the presence of neonates and young of the year. Densities of S. guggenheim in LP peaked in spring and summer along the Uruguayan coast, suggesting a seasonal movement perpendicular to the shore. The reproductive pattern found suggests a population with low productivity.

Keywords: abundance, Chondrichthyes, embryonic growth, life history, reproductive cycle, Squatina guggenheim


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