Enriquecimento de artÃmias com Ãcidos graxos para estudos de suplementaÃÃo em larvas de peixe / Artemia enrichment with fatty acids for supplementation studies in fish larvae

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This work aimed to evaluate the alterations in Artemia salina lipid profile, after enrichment (16 hours) with experimental emulsions containing different concentrations of docosahexaenoic (DHA) and arachidonic acids (ARA), and the effects on growth, survival and fatty acids profile of curimba (Prochilodus lineatus) larvae, an omnivorous fresh water specie, fed on the enriched artemia. The experiment took place at the CEMIGâs âEstaÃÃo Ambiental de Volta Gradeâ (MG, Brazil). Seven different experimental emulsions were elaborated with two levels of ARA: T1 = 22.7 % and T2 = 41,58 % (% in total lipids); two levels of DHA: T5= 21.7 % and T6 = 39.41%; two combinations of ARA and DHA: T3 = 3:1 ARA/DHA (31.30% ARA; 10,07% DHA) and T4 = 1:3 ARA/DHA (12.95% ARA; 30.18% DHA) and a control treatment prepared with olive oil: T7 = 68,65% oleic acid. The fatty acid profile of the artemia was significantly modified by the enrichment in all treatments (Tukey p<0,05). The DHA concentration varied from 0,04% (percentage in total lipids) to 6,64% in the artemias treated with T7 and T6, respectively and the ARA concentration varied from 0,43% to 8,60% in the treatments T7 and T2, respectively. The DHA presence in the emulsions seems to had improved the ARA assimilation by the artemia nauplii indicating a synergism between those two acids. The lipid composition of the larvae varied according with the diet (Tukey, P<0,05) in both sampling periods (8th and 16th day from the beginning of the feeding trail) the larval performance was influenced by the diets. At the end of the experiment (16th day) the standard length was significantly bigger (p = 0,0636) in treatment T4 (9.36Â0.34mm) and T5 (9.27Â0.23mm). The larva weight (wet matter) only differ between treatments in the intermediary sampling (8th day) where the T3, T4, T5 and T7 produced heavier larvae than the other treatments. The survival was not influenced by the diets (Tukey p<0,05). At the end of the experiment, the number of larvae from the treatment T5 e T4 in the post-flexion stage was bigger than in the other ones (p = 0.0793) showing that the larval development was also influenced by the diet. Although curimba is a fresh water specie, the use of HUFA enriched artÃmia can influence larvae growth and development. The best results were achieved with the treatments T4 and T5.

ASSUNTO(S)

araquidÃnico. enriquecimento artÃmias enrichment zootecnia dha arachidonic artemia curimba dha curimba

ACESSO AO ARTIGO

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