Data/hora: 03/06/2024 11:00:10

Provedor de dados: | 27
País: | Belgium
Título: | Effect of vitamin C incorporation in live food on the larviculture success of aquaculture species
Autores: | Merchie, G.; Lavens, P.; Nelis, H.; De Leenheer, A.P.; Sorgeloos, P.
Data: | 1993
Ano: | 1993
Resumo: | A study was undertaken to upgrade the levels of vitamin C in &lt;i&gt;Artemia&lt;/i&gt; and &lt;i&gt;Brachionus&lt;/i&gt; through bioencapsulation and to investigate in this way the requirements for ascorbic acid (AA) during larviculture of fish and prawn. Ascorbyl palmitate (AP) was used as the vit C source because of its stable and lipophylic characteristics which allowed its incorporation in booster emulsions and its readily conversion into AA by &lt;i&gt;Brachionus&lt;/i&gt; and &lt;i&gt;Artemia&lt;/i&gt; . Under standard conditions very high levels of AA could be incorporated into the &lt;i&gt;Artemia&lt;/i&gt; nauplii: supplementation of the enrichment emulsion with 20% AP (w/w) increased the AA-content up to 2000 ppm after 24h enrichment. Also in &lt;i&gt;Brachionus&lt;/i&gt; the AA-level changed in function of the concentration of AP applied. 20% AP in the diet enhanced the AA-content in the rotifers 10-fold over 3 days of culture. Using three different enrichment levels in the live food (0%, 10% and 20%), no differences on growth nor survival could be observed for &lt;i&gt;Macrobrachium rosenbergii&lt;/i&gt; under standard culture conditions. However, a significantly positive effect on the psychological condition of the postlarvae could be demonstrated when the vit C- boosted live food was administrated. For &lt;i&gt;Clarias gariepinus&lt;/i&gt; larvae fed vit C- boosted &lt;i&gt;Artemia&lt;/i&gt; , supplemental dietary ascorbate resulted in a significantly positive effect on growth: the 20% AP group weighed 30% more than the control (0% AP) on the final day of the experiment. Evaluation of the physiological condition showed a significantly higher resistance of the larvae according to the dietary vit C level.&lt;i&gt;Dicentrarchus labrax&lt;/i&gt; larvae were successively fed rotifers (day 4-12) and enriched &lt;i&gt;Artemia&lt;/i&gt; nauplii (day 13-46), supplemented with the same three vitamin C enrichment levels. No significant differences in production characteristics nor in stress resistance of the fish larvae could be observed, however, for all salinity stress tests the 20% AP group performed better.Comparing the results for the two aquaculture fish species, with those reported earlier for the larvae of the prawn &lt;i&gt;Macrobrachium&lt;/i&gt;, it appears that requirements for vit C are species specific, and might even differ according to the culture conditions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2743
Fonte: | %3Ci%3EMededel.+Fac.+landb.+wet.+Rijksuniv.+Gent+58%284b%29%3C%2Fi%3E%3A+1999-2008
Fonte: | info:eu-repo/semantics/restrictedAccess