Collected reprints: Abstract 2952
Collected reprints
Abstract
Curé, K.; Gajardo, G.; Coutteau, P. (1996). The effect of DHA/EPA ratio in live feed on the fatty acid composition, survival, growth and pigmentation of turbot larvae Scophthalmus maximus L.. Improvement of the Commercial Production of Marine Aquaculture Species : 57-67
A set of experiments was designed to understand the effect of standardized enrichment diets on the fatty acid composition and culture performance of turbot larvae reared using the food chain rotifers -freshly hatched Artemia nauplii- enrichedArtemia. Rotifers were fed on experimental diets of similar total n-3 HUFA content (34-39 mg/g DW) but different DHA/EPA ratio (0.7, 2.6 and 5.5). DHA/EPA ratio in Artemia was manipulated by 24-h enrichment with an emulsion with either a high or low DHA/EPA ratio (respectively, 4.0 and 0.7). Results produced by three experiments showed that the n-3 HUFA composition of the rotifers (DHA/EPA 0.7-2.2) was a reflection of the diet composition, which in turn affected the fatty acid composition of the turbot larvae on day 7 (DHA/EPA 2.4-3.4). At day 13, however, when unenriched Artemia (containing EPA only) were fed to the larvae, the differences in the DHA/EPA ratio observed in the larvae where largely neutralized. The n-3 HUFA composition of the enriched Artemia (DHA/EPA 0.4 and 1.5, respectively) was again reflected in the fatty acid composition of the fish larvae at day 30. When the experiment was repeated with enriched Artemia nauplii, a range of different DHA/EPA ratios (0.9 till 4.2) could be obtained in the 16-day old turbot larvae. Although larval survival was low to allow conclusive results, high DPA/EPA ratios in rotifers and enriched Artemia seemed to be beneficial for normal pigmentation development and growth in turbot larvae.
Back to list of volumes
Back to table of contents of volume 26