First Records of the Gymnoblastic Hydroid, Ichthyocodium sarcotretis , on the Copepod, Sphyrion lumpi , from Redfish of the Northwest Atlantic

• Published in: Journal of the Fisheries Research Board of Canada
• Main Author: Templeman, Wilfred
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1973
• Subjects: General Medicine; Newfoundland; Irminger Sea; Labrador Shelf; Northeast Newfoundland Shelf; Labrador Sea; North Atlantic; Northwest Atlantic; Sebastes mentella; Copepods
• Online Access: http://dx.doi.org/10.1139/f73-265; http://www.nrcresearchpress.com/doi/pdf/10.1139/f73-265

The gymnoblastic colonial hydroid Ichthyocodium sarcotretis was found on the copepod Sphyrion lumpi on redfish from three areas of the northwest Atlantic: on copepods (three of ten) on deepwater redfish (Sebastes mentella) from about 200–500 m over great depths at the mouth of the Labrador Sea and, in bottom otter trawling, on copepods on S. mentella or possibly S. fasciatus from the Labrador Shelf (6 of 686) and the northeast Newfoundland Shelf (1 of 364). None were found on 492 S. lumpi from redfish taken on the continental shelf south and west of the northeast Newfoundland Shelf.The characteristics of the hydroid colonies and of their feeding polyps and reproductive hydranths and medusae are compared with published information on this hydroid found on the same hosts in the Irminger Sea and on the copepod, Sarcotretes scopeli, on the lantern fish, Benthosema glaciale, in the North Atlantic. The incidence of the hydroid on S. lumpi on redfish may possibly help in distinguishing Sebastes species in the northwest Atlantic.