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Reproductive cycle of the Patagonian scallop Zygochlamys patagonica in the south-western Atlantic

Published online by Cambridge University Press:  14 May 2008

Silvana Campodónico ,
Gustavo Macchi ,
Betina Lomovasky  and
Mario Lasta
Silvana Campodónico*
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo V. Ocampo No.1, (B7602HSA) Mar del Plata, Argentina
Gustavo Macchi
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo V. Ocampo No.1, (B7602HSA) Mar del Plata, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina (CONICET)
Betina Lomovasky
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina (CONICET) Laboratorio de Ecología, Departamento Biología (FCEyN), Universidad Nacional de Mar del Plata. CC 573 Correo Central (B7600WAG) Mar del Plata, Argentina
Mario Lasta
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo V. Ocampo No.1, (B7602HSA) Mar del Plata, Argentina
*
Correspondence should be addressed to: Silvana CampodónicoInstituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)Paseo V. Ocampo No.1 (B7602HSA) Mar del PlataArgentina email: scampodo@inidep.edu.ar
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Abstract

The reproductive cycle of Zygochlamys patagonica was studied from October 1999 to February 2001 in a bed located in the south-western Atlantic (Reclutas bed 39°24′ S–55°56′W). Scallops were collected monthly and the sexual maturity stages were determined histologically (N = 508). Sex-ratio was 1:1 (t-test P > 0.05). The size of first sexual maturity was estimated from males of an average of 36.63 mm and females of 36.31 mm of shell height. The relative gonadal condition index (RGCI) showed an annual cycle, with higher values during winter–spring and lower values during summer–autumn; an inverse relationship for the relative muscle condition index (RMCI) was observed with maximum values in early summer. Thus, a reallocation of energy from soma to gonad appears to be inevitable to meet energy demand of gonad development. Seven histological stages of sexual maturity were established for both sexes: (1) immature; (2) early maturity; (3) advanced maturity,;(4) ripe; (5) spawning; (6) spent; and (7) recovery. Individuals in early and advanced maturity were found throughout the year; however, they were found more frequently between June and September. Spawning began in October (early spring) and extended through March (late summer–early autumn) coexisting with early and advanced maturity stages supported by the annual variation of the RGCI and the food availability into the system.

Keywords

reproductive cyclegametogenesissize of first maturityZygochlamys patagonicascallops
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 3 , May 2008 , pp. 603 - 611
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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