Publication Abstract

An abnormal thornback ray Raja clavata with additional pectoral fins

J. R. Ellis*

An abnormal thornback ray Raja clavata Linnaeus, 1758 was caught by long line on 9 March 2005 near the Shipwash Bank (south-east of Orford, at approximately 52º 01'N, 01º 39'E). The specimen was an immature male of 54 cm total length (36.5 cm disc width and 27 cm disc length), and weighed approximately 850 g. Two additional fins were present on the dorsal surface, each originating from the mid-line and lying on the right hand side of the fish. The more anterior of these accessory fins was relatively large, and the more posterior accessory fin smaller.

Reference:

J. R. Ellis (2005) An abnormal thornback ray Raja clavata with additional pectoral fins. Transactions of the Suffolk Naturalists' Society, 41: 31-37