Modulation of the free amino acid pool and protein content in populations of the brine shrimp Artemia spp. |
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| Authors: | S. Helland G. V. Triantaphyllidis H. J. Fyhn M. S. Evjen P. Lavens P. Sorgeloos |
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| Affiliation: | (1) Department of Zoology, University of Bergen, Allègt. 41, 5027 Bergen, Norway Fax: +47-55-584450 e-mail: synnove.helland@ifm.uib.no, NO;(2) Laboratory of Aquaculture & Artemia Reference Center, University of Ghent, Rozier 44, 9000 Ghent, Belgium, BE |
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| Abstract: | Free amino acid (FAA) and protein content were measured in various developmental stages of Artemia franciscana, from cysts to Instar III metanauplii. In addition, decapsulated cysts of 15 Artemia populations from different localities were compared with respect to their FAA and protein content. Furthermore, the content and composition of the FAA pool were modulated by hatching the cysts at various salinities, and by enriching the nauplii with algae or a lipid-enrichment emulsion. The FAA content increased threefold from cysts to nauplii, and Instar III metanauplii contained nearly 50% taurine of total FAA. Cysts of A. franciscana were found to contain one-third the amount of FAA compared to the other Artemia species investigated. The content and pool composition of FAA was successfully modulated in 11 of 13 populations, where by the content of FAA was significantly increased when hatched at high salinity. Finally, enrichment elevated the content of FAA and changed the pool composition, thereby showing a dietary effect. Algal enrichment also increased the protein content. Received: 27 September 1999 / Accepted: 17 July 2000 |
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