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Résorption des réserves vitellines et passage de l'endotrophie à l'exotrophie chez la larve de daurade (Sparus aurata) nourrie et à jeun
Guyot, L.; Connes, R.; Diaz, J.P. (1993). Résorption des réserves vitellines et passage de l'endotrophie à l'exotrophie chez la larve de daurade (Sparus aurata) nourrie et à jeun, in: Barnabé, G. et al. (Ed.) Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. EAS Special Publication, 18: pp. 213-226
In: Barnabé, G.; Kestemont, P. (Ed.) (1993). Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. Special Publication European Aquaculture Society, 18. European Aquaculture Society: Gent. 587 pp., meer
In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, meer
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Documenttype: Congresbijdrage
Trefwoord
    Marien/Kust
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  • Guyot, L.
  • Connes, R.
  • Diaz, J.P.
Abstract
    At hatching, the vitelline complex of sea bream includes a syncytial envelope closely bound to the essentially protein vitellus and the oil globule. Resorption of the reserves is accompanied by considerable syncytium activity resulting in thickening and high mitochondria, endoplasmic reticulum and Golgi apparatus contents; it expands by centripetal and contrifugal cytoplasm extensions. These enhance the breakdown of reserves and their transfer to developing organs via the circulatory system which develops around the vitelline complex. Comparison of larvae fed with rotifers and unfed larvae did not reveal any noteworthy differences in use of the vitellus. This became fragmented (yolk platelets) and was almost entirely resorbed during the prelarval phase. In contrast, the consumption of the oil globule continued during the start of the larval period at a higher rate in fed larvae than in unfed larvae and had not stopped at the death of the latter. Glycogen was abundant in the perivitelline syncytium at hatching and disappeared during the first few days of the free life; it was probably taken up in situ. Numerous lipoprotein particles (VLDL-like particles) were produced by the syncytium and released into the circulatory system. This process was intense during the strictly endotrophic period. Lipid circulation subsequently became weak or non-existent during the endo-exotrophic period. The incomplete utilisation of lipid reserves by unfed larvae suggests synergy between exogenous and endogenous factors to ensure harmony of the nutritional mechanisms about one week after hatching.
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