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Spawning pattern and reproductive strategy of female pouting Trisopterus luscus (Gadidae) on the Galician shelf of north-western Spain

Published online by Cambridge University Press:  03 December 2008

Alexandre Alonso-Fernández ,
Rosario Domínguez-Petit ,
Miguel Bao ,
Cathaysa Rivas  and
Fran Saborido-Rey
Alexandre Alonso-Fernández
Affiliation:
Institute of Marine Research (CSIC), C/Eduardo Cabello 6, Vigo. Pontevedra 36208, Spain
Rosario Domínguez-Petit
Affiliation:
Institute of Marine Research (CSIC), C/Eduardo Cabello 6, Vigo. Pontevedra 36208, Spain
Miguel Bao
Affiliation:
Institute of Marine Research (CSIC), C/Eduardo Cabello 6, Vigo. Pontevedra 36208, Spain
Cathaysa Rivas
Affiliation:
Institute of Marine Research (CSIC), C/Eduardo Cabello 6, Vigo. Pontevedra 36208, Spain
Fran Saborido-Rey
Affiliation:
Institute of Marine Research (CSIC), C/Eduardo Cabello 6, Vigo. Pontevedra 36208, Spain
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Abstract

Pouting, Trisopterus luscus is harvested commercially on the Galician shelf by the Spanish inshore artisanal fleet. In spite of a substantial decrease in pouting catches, fishery regulations are limited to size length restrictions. This study provides biological data including length-at-maturity based on histological methods, seasonal maturation, spawning and fecundity. A collection 443 females, from 17 to 42 cm in total length, were sampled from landings (December 2003 to December 2004). Pouting length-at-maturity was estimated as 19.2 cm on average. Pouting females in spawning condition were observed throughout the year and the number of developing oocytes ranged from 20 000 to 1 327 000. Peak spawning was observed between February and April, which correlated well with trends in gonadosomatic index, and inverse to condition factor and hepatosomatic index. Histological examination of the gonads revealed that pouting ovarian development organization is asynchronous, and fecundity is probably determinate.

Keywords

Length-at-maturityFecunditySpawning patternReproductive strategyTrisopterus luscusAtlantic Ocean
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 4 , October 2008 , pp. 383 - 393
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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