Effects of (n-3) highly unsaturated fatty acids compositions of three live prey enrichments on the survival and growth of common dentex’s larvae (Dentex dentex, L)

Abstract

The rotifer Brachionus plicatilis (S-type) and Artemia were fed with three enrichment types (Nanno: Nannochloropsis
occulata, CEP: Commercial Enrichment Products: Selco®
from INVE Aquaculture NV and CLO: Cod Liver Oil
emulsion). The polyunsaturated fatty acid composition in the regimes was tested to estimate survival and growth of
common dentex larvae. During rotifers feeding phase, EPA (20:5n-3) contents were of 4.6 ± 1.46 mg g
-1 DW for Nanno
regime, 5.1 ± 0.22 for the CEP regime and 6.1 ± 0.87 mg g-1 DW for the CLO regime; for DHA (22:6n-3), CLO regime
contains the highest level (7.2 ± 1.26 mg g-1 DW) than the two other regimes. During Artemia feeding phase, EPA
contents were 2.4 ± 0.05, 3.2 ± 0.03 and 8.3 ± 0.41 mg g-1 DW and in DHA 0.4 ± 0.00, 4.4 ± 0.13 and 8.6 ± 0.69 mg g-1 DW
respectively for Nanno, CEP and CLO enrichments. The weight growth of larvae showed a significant difference (p <
0.05) for the rotifers and Artemia feeding phases. The respective SGR for the three enrichments are 8.8, 8.9 and 9.2
and survival rates were of 3.15, 4.03 and 8.35% respectively for Nanno, CEP and CLO regimes.