Separation of Sharp-beaked Redfish, Sebastes fasciatus and S. mentella, from Northeastern Grand Bank by Morphology of Extrinsic Gasbladder Musculature

l-Hsun Ni

Department of Fisheries and Oceans, Research and Resource Services
P. O. Box 5667, St. John's, Newfoundland, Canada, A1C 5X1

Source - Journal of Northwest Atlantic Fishery Science, Volume 2: 7-12
ISSN-0250-7408

 

Ni, I-H. 1981. Separation of Sharp-beaked Redfish, Sebastes fasciatus and S. mentella, from Northeastern Grand Bank by Morphology of Extrinsic Gasbladder Musculature. J. Northw. Atl. Fish. Sci. 2: 7-12. https://doi.org/10.2960/J.v2.a1

 

Abstract

Separation by species of 199 sharp-beaked redfish, collected from northeastern Grand Bank and preliminarily assigned to Sebastes fasciatus or S. mentella on the basis of some subjective exterior characteristics, was confirmed by differences in the passage of the extrinsic gasbladder muscle between the ventral ribs and in its attachment to the vertebrae posteriorly. In S. fasciatus the gasbladder muscle passed between ventral ribs 3-4 in 94% of the specimens and between ribs 4-5 in 5%, whereas in all S. mentella the muscle passed between ventral ribs 2-3. Also, the posterior tendon of the gasbladder muscle in S. fasciatus commonly had three branches attached primarily to vertebrae 8, 9 and 10, whereas in S. mentella the tendons, usually not branched, was attached to vertebra 7.

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Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - October 1981
Publication Type - Journal Article
Descriptors - Atlantic redfishes, Grand Bank, morphology

Citation: Ni, I-H. 1981. Separation of Sharp-beaked Redfish, Sebastes fasciatus and S. mentella, from Northeastern Grand Bank by Morphology of Extrinsic Gasbladder Musculature. J. Northw. Atl. Fish. Sci. 2: 7-12. https://doi.org/10.2960/J.v2.a1