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Enrichment of Artemia nauplii with essential fatty acids and vitamin C: effect on rainbow trout (Oncorhynchus mykiss) larvae performance
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P. Akbary *   , S. A. Hosseini , M. R. Imanpoor |
| , Paria.akbary@gmail.com |
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Abstract: (17605 Views) |
| The effect of essential fatty acids (EFA) and vitamin C-enriched Artemia nauplii on growth, survival, and resistance to temperature (high) stress in rainbow trout larvae reared in tanks were investigated. The larvae (average weight 120.43mg±13.5) were fed 6 times daily starting at the onset of exogenous feeding for 1 week. Triplicate groups of fish were offered one of four treatments (1) commercial starter food for rainbow trout، (2) newly hatched Artemia nauplii (unenriched) ،(3) highly unsaturated fatty acid (HUFA) + vitamin C-enriched Artemia nauplii and (4) combination of 10 % HUFA+ vitamin C enriched nauplii and commercial starter food. After 1 week, all groups of fish were switched to the commercial diet for an additional period of 3 weeks. Statistical analysis of growth after the first week and at the end of the experiment, showed that growth of larvae in various treatments was significantly different (P<0.05). After 4 weeks, the larvae in treatment 3 with the average weight of 657.50 ± 57.93 mg had the highest body weight (P<0.05). The highest percentage of survival (96%) was observed in treatment 3 (P<0.05). Proximate compositions of trout larvae after one week feeding with experimental diets showed that the protein in the larvae of treatments 3 and 4 was significantly different compared to other treatments (P<0.05). The best result of resistance to temperature (up to 24ºC) was observed in larvae reared on treatment 3 with 91.34 ± 1.52 percent (P<0.05). |
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| Keywords: Essential fatty acid, vitamin C, Oncorhynchus mykiss, stress resistance, growth and survival |
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Full-Text [PDF 630 kb]
(7638 Downloads)
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Type of Study: Orginal research papers |
Subject:
aquaculture
Received: 2011/10/30 | Accepted: 2015/09/13 | Published: 2015/09/13
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