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Age, Growth and Sex Ratio of the Azorean Rock-Pool Blenny, Parablennius Sanguinolentus Parvicornis

Published online by Cambridge University Press:  11 May 2009

Ricardo Serrão Santos ,
Richard D. M. Nash  and
Stephen J. Hawkins
Ricardo Serrão Santos
Affiliation:
Universidade dos Açores, Departamento de Oceanografia e Pescas, PT-9900 Horta (Açores), Portugal
Richard D. M. Nash
Affiliation:
University of Liverpool, Port Erin Marine Laboratory, Isle of Man, IM9 6JA
Stephen J. Hawkins
Affiliation:
University of Liverpool, Port Erin Marine Laboratory, Isle of Man, IM9 6JA
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Extract

The age and population structure of Parablennius sanguinolentus parvicornis (Valenciennes) (Pisces: Blenniidae) from the Azores have been studied. Total length and weight relationships are given for each sex. Age study was based on otoliths readings. The von Bertalanffy growth function was applied to describe the growth in total length with age. At the end of the first year mean (±SD) total length was significantly different in males (7.1 ±1.5 cm) and females (6.1 ±1.2 cm). One-year-old males participate in reproduction as satellites, whereas females do not. The implications of this in early growth rate of the males is discussed. During the two most important months of the reproductive season (i.e. June and July), the sex ratio was significantly biased towards males, particularly in the larger size classes.

Type
Short Communications
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 75 , Issue 3 , August 1995 , pp. 751 - 754
Copyright
Copyright © Marine Biological Association of the United Kingdom 1995

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