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image of Crustaceana

Nauplii of the anostracan Chirocephalus ruffoi were grown until sexual maturity under standard laboratory conditions (18 +/- 1 C; 12L/12D; 1600 lux light intensity) and fed ad libitum once a day on either an alga (Selenastrum capricornutum), baker's yeast, or a formulated diet. Both parents and cysts, as well as feeds were analysed for their fatty acid profiles and compared with wild adults and cysts. Significant differences (P < 0:05) were recorded among the different treatments. As far as total lipid content is concerned, a correlation was found between feeds and adult shrimps as well as between the latter and the cysts they produced during the different feeding tests. Significant differences (P < 0:05) were also recorded from a qualitative point of view. The results obtained provided evidence that the fatty acid profile of both fairy shrimps and cysts can be manipulated in order to improve their nutritional effectiveness, as it was previously shown in the case of the brine shrimp Artemia (Millamena et al., 1988; Lavens et al., 1989; Navarro & Amat, 1992) and of two other freshwater anostracan species (Mura et al., 1997a).

Des nauplii de l'anostrace Chirocephalus ruffoi ont ete eleves jusqu'a maturite sexuelle dans des conditions standard de laboratoire (18 +/- 1 C, 12L/12D, 1600 lux d'intensite lumineuse) et nourris a volonte une fois par jour, soit avec une algue (Selenastrum capricornutum), soit avec de la levure de biere, soit avec une formule composee. Les adultes et les oeufs de duree, ainsi que les aliments, ont ete ensuite analyses quant a leur teneur et composition en acides gras et compares aux adultes et aux oeufs de duree sauvages. Des differences significatives (P < 0,05) ont ete notees suivant les differents traitements. En ce qui concerne le contenu total en lipides, une correlation a ete trouvee entre les aliments et les adultes ainsi qu'entre ces derniers et les oeufs de duree qu'ils produisent au cours des differents tests de nutrition. Des differences significatives (P < 0,05) ont ete observees d'un point de vue qualitatif. Les resultats obtenus mettent en evidence que le profil d'acides gras a la fois des anostraces et de leurs oeufs peut etre manipule dans le but d'ameliorer l'efficacite de la nutrition, comme il avait ete montre dans le cas d' Artemia (cf. Millamena et al., 1988; Lavens et al., 1989; Navarro & Amat, 1992) et de deux autres especes d'anostraces des eaux douces (Mura et al., 1997a).


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