Efeito da bioencapsulação de ácidos graxos essenciais em artêmia sp. utilizada na alimentação de pós-larvas de bijupirá(Rachycentron canadum)

Abstract

The present study had as objective evaluates the effect of the enrichment of essential fatty acids in Artemia in the feeding of Cobia fish larvae (Rachycentron canadum) in closed water system. In the present study the treatments were defined as 1:1 of n3 Yeast 60® and Red Papper® (TR-1 = RED+YEAST) and 1:1 of n3 Yeast 60® and Algamac 3050® (TR-2 = A3050+YEAST), respectively, appraised the profiles of essential fatty acids in the products, and Cobia larvae. The fish larvae were fed four times a day in a density of 1 artemia/ml among the 10th to 18th DAE exclusively with artemia originating from of the two treatments. The commercial products TR-1 and TR-2 as well as the enriched artemia by them presented profiles significantly different (p <0,05) for the linoleic acid, DHA, total of AGPI, n-3 AGPI, n-6 AGPI and DHA/EPA. The linolenic acid, ARA and EPA didn't present significant correlation among the treatments in the artemia enrichment. And the post-larvae fed with artemia enriched with TR-2 presented a significant ncrease in DHA and in the n-3 total AGPI as post-larvae fed with artemia enriched with TR-1. The results obtained in this study indicate the low efficiency in the incorporation of DHA and the relationship DHA/EPA in the artemia fed with TR-1, suggesting a conversion of that fatty acid EPA. However, the cobia possess a high incorporation of essential fatty acids, after a feeding period with artemia enriched. Different from other species of sea fish the cobia doesn't evidence the prolongation of the chain of the essential fatty acids, but preferentially retention in the tissue of the post-larvae. Key-words: Fatty acids, enrichment, incorporation, larviculture.