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Production dynamic and nutritive quality of the freshwater rotifer Brachionus calyciflorus Dynamique de production et qualite nutritive du rotifere deau douce Brachionus calyciflorus

Awaiss, A.; Kestemont, P.

Aquatic Living Resources 102: 111-120

1997


ISSN/ISBN: 0990-7440
Accession: 038573513

Production dynamics and nutritional quality of the freshwater rotifer Brachionus calyciflorus as live food for freshwater fish larvae were assessed after determination of the development rate of this species fed the algae Dictyosphaerium chlorelloides. These aspects were investigated by a study of population dynamics (daily rate of production, duration of embryonic development and minimum generation time, fecundity of amictic females) and of the biochemical composition of the cultured organisms. Duration of embryonic development, highly dependent on temperature, ranged from 7 to 13.4 h. Maximum reproduction rate was reached at 25 degree C, with 22.1 eggs per female. Female origin (young amictic females or females first-cultivated with D. chlorelloides affects significantly the results of production. At the end of the production cycle, rotifer density reached 245 and 188 ind cntdot ml-1, respectively. Regarding nutritional quality of rotifers, crude protein contents did not vary significantly throughout the production cycle (53.5-54.1% of dry matter), Among the fatty acids, linoleic acid C18:2 n-6 was the most abundant. This acid represented up to 42% of the total identified fatty acids at the end of the production cycle with females first-cultivated with D. chlorelloides.

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