| Registro completo |
| Provedor de dados: |
OMA
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| País: |
Belgium
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| Título: |
The effect of supplemental ascorbic acid in enriched live food for <i>Clarias gariepinus</i> larvae at startfeeding
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| Autores: |
Merchie, G.
Lavens, P.
Verreth, J.
Ollevier, F.P.
Nelis, H.
De Leenheer, A.P.
Storch, V.
Sorgeloos, P.
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| Data: |
1997
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| Ano: |
1997
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| Palavras-chave: |
Fish larvae
Food organisms
Vitamin C
Clarias gariepinus
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| Resumo: |
The effect of three dietary ascorbic acid (AA) concentrations, each applied via two feed types, on production characteristics and physiological condition of African catfish (<i>Clarius gariepinus</i>) larvae has been assessed in two 10-day culture trials. Three treatments received only <i>Artemia</i> nauplii enriched with an experimental emulsion containing 0, 10 or 20% ascorbyl palmitate (AP) and yielding 530, 1200 and 1600 µg AA g<sup>-1</sup> DW <i>Artemia</i> , respectively; the other three treatments were fed the same <i>Artemia</i> 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%- 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%- <i>Artemia</i> series. These differences had occurred by day 2, which might be indicative of the importance of AA in early development. A second trial, which was a repetition of the first one, revealed the same tendencies; however, growth differences were smaller, probably due to the higher incorporation levels of AA obtained in the live diet (530, 1700 and 2300 µg AA g <sup>-1</sup> DW) and in the catfish larvae. Growth results of both experiments were supported with data from the ultrastructural evaluation of the hepatocytes: i.e. a more organized cell compartmentation and better-structured cell organelles in the 20%-AP group of the <i>Artemia</i> series compared to the control are indicative of a more active metabolism. The slow growth in the cofeeding series was documented by the poor condition of the hepatocytes.In a third experiment it was verified that the growth effect of the 20%-AP boosted <i>Artemia</i> diet was the result of the extra AA incorporation and not of the concomitant palmitic acid (PA), which was set free after hydrolysis of AP in the <i>Artemia</i> nauplii, and which could possibly be used as a supplemental energy source. The three treatments were fed <i>Artemia</i> nauplii enriched with 0% AP, 12% PA and 20% AP, respectively. Growth and stress resistance of the latter group were significantly higher compared to the control and the PA-supplemented fish. To our knowledge this is the first evidence for the positive role of high dietary vitamin C levels (more than 1500 µg AA g<sup>-1</sup> DW) on larval development of an aquaculture species, and more specifically of <i>C. gariepinus</i>.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2963
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| Fonte: |
%3Ci%3EAquaculture+151%3C%2Fi%3E%3A+245-258
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| Direitos: |
info:eu-repo/semantics/restrictedAccess
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