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FIN-RAY COUNT VARIATION IN 0-GROUP FLATFISH: PLAICE ( PLEURONECTES PLATESSA (L.)) AND FLOUNDER ( PLATICHTHYS FLESUS L.) ON THE WEST COAST OF IRELAND

FIN-RAY COUNT VARIATION IN 0-GROUP FLATFISH: PLAICE ( PLEURONECTES PLATESSA (L.)) AND FLOUNDER (... During the autumns of 2005 and 2006, 0-group plaice ( Pleuronectes platessa (Linnaeus)) and flounder ( Platichthys flesus Linnaeus) were collected from beaches in Galway and Kerry on the west coast of Ireland by beach seining and push netting. Characteristics used to identify adult flatfish were not discernible in these juveniles, and fin-ray counts were used to differentiate between the species. The dorsal, anal and caudal rays of 325 plaice and 116 flounder were counted and plotted, resulting in a clear separation between the two species. Thus, fin-ray counts may be used to reliably separate these two species on the west coast of Ireland. The ranges observed for both species lie within those previously reported. Analysis of fin-ray counts for both plaice and flounder showed no significant difference between the two regions studied. However, for plaice, a significant difference in dorsal fin-ray numbers was observed between the Galway beaches. No evidence of plaice/flounder hybrids, as identified by intermediate ray counts, was observed. There was no relationship between the numbers of dorsal and anal fin rays for plaice. However, a positive relationship was found between the numbers of dorsal and anal rays for flounder. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biology and Environment: Proceedings of the Royal Irish Academy Royal Irish Academy

FIN-RAY COUNT VARIATION IN 0-GROUP FLATFISH: PLAICE ( PLEURONECTES PLATESSA (L.)) AND FLOUNDER ( PLATICHTHYS FLESUS L.) ON THE WEST COAST OF IRELAND

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Publisher
Royal Irish Academy
Copyright
Copyright © 2008 RIA
ISSN
0791-7945
eISSN
2009-003X
DOI
10.3318/BIOE.2008.108.2.61
Publisher site
See Article on Publisher Site

Abstract

During the autumns of 2005 and 2006, 0-group plaice ( Pleuronectes platessa (Linnaeus)) and flounder ( Platichthys flesus Linnaeus) were collected from beaches in Galway and Kerry on the west coast of Ireland by beach seining and push netting. Characteristics used to identify adult flatfish were not discernible in these juveniles, and fin-ray counts were used to differentiate between the species. The dorsal, anal and caudal rays of 325 plaice and 116 flounder were counted and plotted, resulting in a clear separation between the two species. Thus, fin-ray counts may be used to reliably separate these two species on the west coast of Ireland. The ranges observed for both species lie within those previously reported. Analysis of fin-ray counts for both plaice and flounder showed no significant difference between the two regions studied. However, for plaice, a significant difference in dorsal fin-ray numbers was observed between the Galway beaches. No evidence of plaice/flounder hybrids, as identified by intermediate ray counts, was observed. There was no relationship between the numbers of dorsal and anal fin rays for plaice. However, a positive relationship was found between the numbers of dorsal and anal rays for flounder.

Journal

Biology and Environment: Proceedings of the Royal Irish AcademyRoyal Irish Academy

Published: May 1, 2008

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