The effect of supplemental ascorbic acid in enriched live food for Clarias gariepinus larvae at startfeeding
Merchie, G × Lavens, P Verreth, J Ollevier, Frans Nelis, H DeLeenheer, A Storch, V Sorgeloos, P #
Elsevier science bv
Aquaculture vol:151 issue:1-4 pages:245-258
The effect of three dietary ascorbic acid (AA) concentrations, each applied via two feed types, on production characteristics and physiological condition of African catfish (Clarias gariepinus) larvae has been assessed in two 10-day culture trials. Three treatments received only Artemia nauplii enriched with an experimental emulsion containing 0, 10, or 20% ascorbyl palmitate (AP) and yielding 530, 1200 and 1600 mu g AA g(-1) DW Artemia, respectively; the other three treatments were fed the same Artemia diets which were partially substituted by an artificial diet containing no vitamin C (ratio 20:80), No differences in survival could be observed; however, from day 6 onwards the 20%-AP group showed significantly better growth compared to the 0%- and 10%-AP treatments, For the cofeeding series, the same positive, but not significant, influence of vitamin C on dry weight was found. Moreover, the animals receiving the highest vitamin C supplementation displayed a considerably lower stress sensitivity than those of the 0%- and the 10%-AP groups, for both the 100%- and the 20%-Artemia series. These differences had occurred by day 2, which might be indicative of the importance of AA in early development.