27 research outputs found

    Sea bass (

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    This paper describes the large-scale production of eggs and larvae of sea bass (Dicentrarchus labrax) and shows how spawning can be planned to produce viable eggs throughout the year by manipulation of photoperiod and temperature. The rearing temperature was 9.5-22 °C during spawning and 9-24 °C during the gametogenesis. The photoperiodic cycles tested were normal (i. e. the photoperiodic cycle observed at Palavas-les-Flots, mediterranean coast, France, 1984/1987) advanced by 3 to 5 months and delayed by 2 months

    Intensive recirculation production system in seabass, Dicentrarchus labrax L.

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    The characteristics of sea bass (

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    This paper concerns eggs of captive fish and gonads of wild fish, from the Brittany coast obtained in the 7-18 °C thermal range. The diameters of eggs, 1.07-1.32 mm are compared to those observed in other areas, especially along the Mediterranean coast. The duration of embryogenesis as a function of temperature and the efficiency of different incubators are discussed. The quality of eggs in relation with larval survival is discussed through the biochemical composition of the eggs collected in captivity compared to that of wild fish gonads. The absolute values of lipids, proteins, fatty acids, lipid classes, phosphatides and minerals measured, also the positive relations obtained between egg dry weight, diameters, mortality during incubation are presented as criteria of egg quality

    Current status of the French intensive larval rearing techniques for sea bass (Dicentrarchus labrax) & sea bream (Sparus auratus)

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    Optimizing the exploitation of wild and reared bluefin tunas under the constraint of sustainability: the Ifremer R&D project

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    A brief account is given of a research project commenced in 2000 by IFREMER concerning aspects of wild bluefin farming in offshore cages and reproduction control in land-based facilities. Three inter-related sub­ projects have been suggested: (i) wild fish ongrowing and/or fattening; (ii) reproduction; and (Hi) fingerling production and improvement of the understanding of early stage recruitment limitations. The Integration of this project in other EU community activities is discussed."Optimisation de l'exploitation de thons rouges sauvages et élevés, en tenant compte de la contrainte de durabilité: Le projet de R&D d'IFREMER". Un bref rapport est présenté sur un projet de recherche entamé en l'an 2000 par IFREMER concemant des aspects d'élevage du thon rouge sauvage dans des cages offshore et sous reproduction contrôlée dans des installations à terre. Trois sous-projets étroitement liés ont été suggérés: (i) élevage de poissons sauvages et/ou engraissement; (ii) reproduction; et (iii) production d'alevins et meilleure compréhension des limitations du recrutement des stades précoces. L'intégration de ce projet dans d'autres activités de la communauté de l'UE est discutée

    VALDORA 2018. Etude de la perte de poids au jeûne sur deux classes de poids de dorades sauvages, Sparus aurata, maintenues en vivier

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    L’étude a été menée sur deux classes de poids (260-450g et 460-980 g) de dorades sauvages maintenues à jeun en vivier pendant 40 jours après 3 semaines de captivité en cages sans alimentation. Au cours de cette phase de captivité les conditions de température ont progressivement évolué de 16.5 à 9.3 °C. Le taux de saturation en oxygène est resté supérieur à 95%. Les autres conditions de stockage ont été estimées non limitantes. Dans ce contexte, la perte de poids individuelle mesurée sur 2 lots de 30 individus de chaque classe de poids est de 3.7% pour les plus petits et de 3.3% pour les plus gros poissons
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