Effects of dietary vitamin C on fish and crustacean larvae
Merchie, G.; Lavens, P.; Sorgeloos, P. (1995). Effects of dietary vitamin C on fish and crustacean larvae, in: Lavens, P. et al. (Ed.) Larvi '95: Fish & Shellfish Symposium, Gent, Belgium, September 3-7, 1995. EAS Special Publication, 24: pp. 229
In: Lavens, P.; Jaspers, E.; Roelants, I. (Ed.) (1995). Larvi '95: Fish & Shellfish Symposium, Gent, Belgium, September 3-7, 1995. Special Publication European Aquaculture Society, 24. European Aquaculture Society: Gent. ISBN 90-71625-14-1. XXVI, 521 pp., more
In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, more
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| Authors | | Top |
- Merchie, G.
- Lavens, P., more
- Sorgeloos, P., more
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| Abstract |
In order to assess the dietary needs for ascorbic acid (AA) at startfeeding, the AA content in the various live diets currently applied in aquaculture (algae, rotifers, Artemia ) was studied. Application of boosting techniques using ascorbyl palmitate (AP) as the vitamin C source enabled the transfer of elevated levels of bioactive vitamin C (up to 2500µg AA.g DW-1) via the live food chain into larvae of fish (Clarias gariepinus, Dicentrarchus labrax, Scophthalmus maximus), shrimp (Pennaeus vannamei) and prawn (Macrobrachium rosenbergii). This vitamin C enrichment procedure has proven to be a valuable technique, especially for the evaluation of the effects of dietary vitamin C when supplemented at high levels, on for example stress resistance. However, for most species examined, the initial level of AA in Brachionus and Artemia impairs the determination of the minimal requirements for this component. Formulated diets containing variable levels of stable AA-phosphate esters were used for the determination of minimal requirements for AA in the early post-weaning stage of marine fish species (Dicentrarchus labrax, Scophthalmus maximus) and the postlarval stage of penaeid shrimp (Penaeus monodon, Penaeus vannamei). For both fish species examined results indicated that 20mg AA.kg per diet is sufficient for normal growth and survival. Requirements for production of postlarval shrimp amount to minimum 20 and 130mg AA.kg per diet, for P. monodon, resp. P. vannamei, while a level of 2000mg AA.kg per diet is needed to enhance the resistance of the shrimp postlarvae to stress conditions and bacterial infections. |
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