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Problems with assigning the ovaries of sardine (Sardina pilchardus) to the appropriate macroscopic maturity stage

Published online by Cambridge University Press:  28 January 2009

Isabel Afonso-Dias ,
Patrícia Amorim  and
Alexandra Silva
Isabel Afonso-Dias*
Affiliation:
UALG-CCMAR, Campus de Gambelas, 8005-139 Faro, Portugal
Patrícia Amorim
Affiliation:
INIAP-IPIMAR, Av. Brasilia, 1449-006 Lisboa, Portugal
Alexandra Silva
Affiliation:
INIAP-IPIMAR, Av. Brasilia, 1449-006 Lisboa, Portugal
*
Correspondence should be addressed to: Isabel Afonso-Dias, UALG-CCMAR, Campus de Gambelas, 8005-139 Faro, Portugal email: [email protected]
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Abstract

It has proved difficult to assign with confidence sardine ovaries to the six-stage macroscopic maturity scale proposed by Pinto & Andreu, which was drawn up using macroscopic and microscopic criteria. The extent to which sardine ovaries classified on the basis of their external appearance had been assigned to the ‘correct’ microscopic maturity stage was determined. There was a great deal of misclassification, most of which concerned the allocation of ovaries to Phase III and Phase V(III). The problem can be resolved, without the loss of any significant biological information, by combining Phase III and V(III). The loss of information by merging these two stages is negligible compared with the gain in precision and sampling time. Subsequently, a simplified macroscopic maturity scale with just five stages is proposed. The immature and resting ovaries should be grouped in just one maturity stage, Phase I, as proposed by Pinto & Andreu.

Keywords

Sardina pilchardusmaturation scaleovary development
Type
Research Article
Information
Marine Biodiversity Records , Volume 1 , January 2008 , e20
Copyright
Copyright © Marine Biological Association of the United Kingdom 2007

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