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Size at first sexual maturity in Zidona dufresnei (CAENOGASTROPODA: VOLUTIDAE) of the south-western Atlantic Ocean (Mar del Plata, Argentina)

Published online by Cambridge University Press:  20 March 2003

Juliana Giménez  and
Pablo E. Penchaszadeh
Juliana Giménez
Affiliation:
CONICET, Lab. Invertebrados, Depto. Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina, E-mail: [email protected]
Pablo E. Penchaszadeh
Affiliation:
CONICET, Lab. Invertebrados, Depto. Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina, E-mail: [email protected] Museo Argentino de Ciencias Naturales, Avenida Angel Gallardo 470, Buenos Aires, Argentina, E-mail: [email protected]
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Abstract

Size at sexual maturity was studied in Zidona dufresnei through analysis of gonadal tissue samples and secondary sexual characters. Individuals were sampled during two reproductive seasons (austral spring–summer) in the Mar del Plata area, Argentina. Gonadosomatic index was estimated for males and oocyte size frequency was used to estimate the stage of gonadal development in females. Gonadal maturity occurred prior to the development of secondary sexual characters. Size at first gonadal maturity in females was 12·8 cm shell length and in males 12·0 cm shell length, but size at which 50% of the population was mature was 15·7 cm in females and 15·0 cm in males. The results of this study could help to establish a minimal catching size.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 83 , Issue 2 , April 2003 , pp. 293 - 296
Copyright
2003 Marine Biological Association of the United Kingdom

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