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Cycle de la matière et variabilité environnementale en élevage larvaire de Litopenaeus stylirostris en Nouvelle-Calédonie ArchiMer
Millot, Anne-sophie.
Since 2005, shrimp livestock of Litopenaeus stylirostris in New Caledonia has dealed with production issues. One of them concerns the lack of postlarvae following high mortality rates in hatcheries. This study aims the evolution of the environmental quality status in three rearing from nauplius to postlarvae stage. Among nutrients, total ammonia nitrogen (TAN), soluble reactive phosphorus (SRP), nitrates and nitrites (NOx) have been quantified. Organic matter was also estimated through dissolved organic nitrogen (DON), urea nitrogen and colored dissolved organic matter (CDOM). Finally, bacteria were followed through bacterial abundance and respiration. The hatchery cycle can be divided in two stages: the first one in which antibiotics were delivered to...
Tipo: Text Palavras-chave: Écloserie de crevette; Milieu d’élevage; Cycle de l’azote; Compartiment bactérien; Gestion des déchets; Shrimp hatchery; Rearing environment; Nitrogen cycle; Bacterial compartment; Waste management.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00472/58368/60928.pdf
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Temporal variability in dissolved inorganic nitrogen fluxes at the sediment-water interface and related annual budget on a continental shelf (NW Mediterranean) ArchiMer
Denis, Lionel; Grenz, Christian; Alliot, Elisabeth; Rodier, Martine.
Sediment-water dissolved inorganic nitrogen fluxes were measured monthly between November 1997 and January 1999 at two sites on the continental shelf in the Gulf of Lions. Exchanges of ammonium, nitrate and nitrite were measured using whole core incubations performed in the laboratory at in situ temperature and in the dark;. Stations were located on the shelf and near the shelf break. Nitrate release represented the major part of total dissolved inorganic nitrogen fluxes (52-98%). At station Soft, nitrate flux doubled from winter-early spring to August (4 to 10 mu mol m(-2) h(-1)). At station R, a large increase (2 to 14 mu mol m(-2) h(-1)) was recorded between December 1997 and January 1998, after which flux tended to decrease. Ammonium flux was generally...
Tipo: Text Palavras-chave: Flux à l’interface eau–sédiment; Azote inorganique dissous; Variabilité temporelle; Cycle de l’azote; Méditerranée nord occidentale; Sediment-water flux; Dissolved inorganic nitrogen; Temporal variability; Nitrogen cycling; NW Mediterranean.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00323/43371/42839.pdf
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