Effect of light irradiation on dynamics of vitamin A compounds in rotifers and Artemia

Abstract

The dynamics of vitamin A (VA) compounds in live food during enrichment were examined under different light conditions. Rotifers Brachionus plicatilis and Artemia nauplii (Artemia) were enriched with or without 10 mg VA palmitate (VAp) in 1 L of culture medium for 24 h under either bright (2000 lx), or dark (<1 lx) conditions. VAp, retinol (ROH), retinal (RAL) and retinoic acid (RA) contents were analyzed at 0 h (before enrichment) and at 3, 6, 12, 18 and 24 h after the onset of enrichment. Retinoid content in rotifers enriched in darkness was always higher than that enriched under light. VAp content showed two peaks at 3 and 18 h in rotifers enriched in darkness, but it showed one peak at 3 h in rotifers enriched under light. ROH and RA contents increased over the 24-h period in rotifers enriched in darkness, whereas they decreased 12 h onward in rotifers enriched under light. In Artemia, VAp and ROH contents were always higher than when enriched under the bright condition, but their dynamics showed a similar pattern in Artemia enriched under dark and bright conditions.

Progress on larval and juvenile nutrition to improve the quality and health of seawater fish: a review

“…The previous observations that Artemia was more likely than rotifer to cause skeletal anomalies at a lower concentration of vitamin A appears to be due to the differential retinoic acid levels produced by metabolism in the two types of live foods. A possible contributing factor to this was found in the next study on the effect of photoirradiation during the culture of live foods: light shielding suppressed metabolism to retinoic acid in rotifer but had no effect in Artemia [54].…”

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“…These embryos were dehydrated and stored in a vacuum until they hydrated again and decapsulated to carry on to the hatching process for 24 hours [6] . Nauplius were used as live food from the first stages of different fishes and crustaceans [7,8,9,10,11,12] , because their high protein and high unsaturated fatty acids (HUFA) content (20.5w3: 22:6w3) which play an important role in different metabolic functions of cultured organisms [13,14] , but it is necessary that all stages of A. franciscana was cultured in an optimal diet to acquire better nutritional components to those species which fed them [15] . In the last few years, A. franciscana culture technique was modified to reach high biomass volumes with low water content and costs.…”

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“…These embryos were dehydrated and stored in a vacuum until they hydrated again and decapsulated to carry on to the hatching process for 24 hours [6] . Nauplius were used as live food from the first stages of different fishes and crustaceans [7,8,9,10,11,12] , because their high protein and high unsaturated fatty acids (HUFA) content (20.5w3: 22:6w3) which play an important role in different metabolic functions of cultured organisms [13,14] , but it is necessary that all stages of A. franciscana was cultured in an optimal diet to acquire better nutritional components to those species which fed them [15] . In the last few years, A. franciscana culture technique was modified to reach high biomass volumes with low water content and costs.…”