54 research outputs found

    L'anguille européenne Anguilla anguilla, un poisson sensible aux stress environnementaux et vulnérable à diverses atteintes pathogÚnes

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    Les diverses agressions, tant naturelles que d'origine anthropique, dont les anguilles peuvent ĂȘtre victimes sont passĂ©es en revue. Les donnĂ©es de la littĂ©rature concernent aussi bien des observations dans les milieux naturels que des rĂ©sultats expĂ©rimentaux acquis en laboratoire. L'ensemble des connaissances dĂ©montre largement que ce poisson n'est pas aussi rĂ©sistant qu'il est gĂ©nĂ©ralement admis. Sa sensibilitĂ©, sa vulnĂ©rabilitĂ© vis-Ă -vis d'un ensemble de facteurs dĂ©favorables (dĂ©gradation de la qualitĂ© des habitats, altĂ©rations de la qualitĂ© de l'eau, parasitoses et bactĂ©rioses ...) contribuent Ă  une trĂšs importante rĂ©duction du stock europĂ©en et justifient pleinement son rĂ©cent statut d'espĂšce menacĂ©e

    Flow cytometry based techniques to study testicular acidophilic granulocytes from the protandrous fish gilthead seabream (Sparus aurata L.)

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    The gilthead seabream is a protandrous seasonal breeding teleost that is an excellent model for studying the testicular regression process which occurs in both seasonal testicular involution and sex reversion. Little is known about the cell types and the molecular mechanisms involved in such processes, mainly because of the lack of appropriate methods for testis dissociation, and testicular cell isolation, culture and functional characterization. We have previously reported that gilthead seabream acidophilic granulocytes infiltrate the testis at post-spawning stage, settle close to the spermatogonia and accumulate intracellular interleukin-1ÎČ. In this paper, we report several flow cytometry based assays which allow to establish the role played by gilthead seabream testicular acidophilic granulocytes and permits their quantification

    La gonadogenĂšse des Poissons

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