Production of live food enriching suspensions

Enrichment of live-food for aquatics, to enhance their nutritional value, is essential for fish aquaculture. Accordingly, various commercial suspensions are prepared and are available in the world. These suspensions are widely used in Iranian aquaculture. In this study, in order to prepare similar suspensions in the Research Institute, analysis of foreign suspension was done. In this study Artemia nauplii were used as the representative live-food. Shark liver oil and extraction of sunflower oil and other substances were also used. Suspensions were compared with the control sample via various tests. Live foods were enriched with fatty acids in the suspensions as defined according to standard procedures. The results showed that the enriching percent of these suspensions in control nauplii and research center enriched nauplii were 3±37 and 25 ± 3, respectively. Then the influence of live enriched Artemia nauplii on 500 new feed trout larvae in 4 treatments were experimented for a 30 days period, to evaluate the biometric factors. The results showed that treatments 1 and 2 significantly differed compared with the treatments 3 and 4 in survival, growth rate, the total length and the abnormalities. However, no significant difference was observed between treatment 3 and 4 together. Final research results suggest that the prepared suspension containing essential fatty acids similar to foreign samples was successful in all field trials.