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Preliminary study on the gonad development of the exotic ascidian Styela clava in Cork Harbour, Ireland

Published online by Cambridge University Press:  01 December 1999

L.E. Parker ,
S. Culloty ,
R.M. O'Riordan ,
B. Kelleher ,
S. Steele  and
G. Van der Velde
L.E. Parker
Affiliation:
Laboratory of Aquatic Ecology, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
S. Culloty
Affiliation:
Department of Zoology and Animal Ecology, National University of Ireland, Lee Maltings, Prospect Row, Cork, Ireland
R.M. O'Riordan
Affiliation:
Department of Zoology and Animal Ecology, National University of Ireland, Lee Maltings, Prospect Row, Cork, Ireland
B. Kelleher
Affiliation:
Laboratory of Aquatic Ecology, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
S. Steele
Affiliation:
Department of Zoology and Animal Ecology, National University of Ireland, Lee Maltings, Prospect Row, Cork, Ireland
G. Van der Velde
Affiliation:
Laboratory of Aquatic Ecology, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
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Abstract

The reproductive cycle, development and spatial organization of the gonads of an exotic ascidian, Styela clava, were studied in Cork Harbour, Ireland. Monthly histological samples enabled the division of gonad development into six main stages, ranging from `inactive' to `regression'. Gonad development was asynchronous in the population, with more than one stage being found within some months. Gametogenesis was observed from February–November, but peaked between August–October. Spawning took place in September–October, followed by gonad regression in November–December.

Type
Brief Report
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 79 , Issue 6 , December 1999 , pp. 1141 - 1142
Copyright
© 1999 Marine Biological Association of the United Kingdom

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