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Introduction Teratological phenomena have been reported from a range of fish taxa; however, among chondrichthyans such observations are rare ( Laale and Lerner, 1981 ; Heupel et al., 1999 ), particularly for embryos. The first record of a deformed elasmobranch is attributable to Aldrovandi, who in 1642 described a dicephalic shark embryo ( Gudger, 1936 ). Since then, infrequent reports of deformed shark embryos have occurred in the literature including cases of cyclopia, dicephally and skeletal anomalies (e.g. Dean, 1923 ; Abe, 1972 ; Escobar‐Sánchez et al., 2009 ). Because of the rarity of such cases, reported herein is the collection of a severely deformed blacktip shark, Carcharhinus limbatus (Müller and Henle, 1839), embryo from the northern Gulf of Mexico. Materials and methods On 3 March 2011, a biologist was examining the catch of a fishery operating off the coast of Venice, Louisiana, USA (approximately 29.00°N, 89.50°W). While the shark catch was being eviscerated, an unusual embryo was observed in a blacktip shark. The female blacktip shark, estimated to weigh 35 kg, contained two embryos, one which showed normal signs of development while the other was deformed ( Fig. 1 ). Unfortunately, after obtaining photographs of the deformed
Journal of Applied Ichthyology – Wiley
Published: Oct 1, 2012
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