Performance of juvenile Hippocampus erectus (Perry 1810) fed live diets with different HUFA levels.

Nicolás Vite


DOI: https://doi.org/10.3856/vol42-issue1-fulltext-12

Abstract


Survival of seahorses during their first months after birth is one of the bottlenecks for consolidating the seahorse farming industry. In this work we used enriched Artemia with different highly unsaturated fatty acid (HUFA) levels to feed juvenile Hippocampus erectus for 60 days to assess growth and survival, biochemical composition (carbohydrates, proteins, and lipids), and fatty acid profile after treatment. HUFA levels on live food had a significant influence on seahorses’ fatty acid composition. After a 60-day treatment with HUFA-enriched Artemia nauplii with 9 or 13% of docosahexaenoic acid (DHA), H. erectus juveniles had more than 20% of DHA in tissues, similarly to recently-born juveniles before first ingestion. However, DHA in juvenile seahorses fell to 4-5% after 60 days of treatment in HUFA-lacking treatments. Likewise, variations of eicosapentaenoic acid (EPA) levels were significantly influenced by concentration of this fatty acid in live food: 2-3% in seahorses’ tissues in the HUFA-lacking treatment and 5-7% in HUFA-enriched treatments. Growth was significantly correlated to DHA levels in seahorses’ tissues (r2 = 0.89; P<0.01), but correlation with survival and DHA was not as strong (r2 = 0.44; P<0.05).  Thus, juvenile H. erectus seahorses seem to perform better during culture when they have at least 20% of DHA in their tissues and particularly in reference to growth, which could be attained with approximately 10% of DHA in Artemia nauplii.

Vite N. Performance of juvenile Hippocampus erectus (Perry 1810) fed live diets with different HUFA levels.. Lat. Am. J. Aquat. Res.. 2017;42(1). Available from: doi:10.3856/vol42-issue1-fulltext-12 [Accessed 24 Jan. 2019].
Vite, N. (2017). Performance of juvenile Hippocampus erectus (Perry 1810) fed live diets with different HUFA levels.. Latin American Journal of Aquatic Research, 42(1). doi:http://dx.doi.org/10.3856/vol42-issue1-fulltext-12