en aquaculture aquaculture پژوهشي Orginal research papers <span style="FONT-FAMILY: "Times New Roman","serif" FONT-SIZE: 12pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: EN-US mso-ansi-language: EN-US mso-fareast-language: EN-US">The effect of essential fatty acids (EFA) and vitamin C-enriched <i>Artemia</i> nauplii on growth, survival, and resistance to temperature (high) stress in <font size="3"><font face="Times New Roman"><span style="COLOR: black">rainbow</span> 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</font></font></span><span dir="rtl"></span><span style="FONT-FAMILY: "Times New Roman","serif" FONT-SIZE: 12pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: AR-SA mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl" lang="AR-SA"><span dir="rtl"></span>،</span><span dir="ltr"></span><span style="FONT-FAMILY: "Times New Roman","serif" FONT-SIZE: 12pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: EN-US mso-ansi-language: EN-US mso-fareast-language: EN-US"><span dir="ltr"></span> (2) newly hatched <i>Artemia</i> nauplii (unenriched)</span><span dir="rtl"></span><span style="FONT-FAMILY: "Times New Roman","serif" FONT-SIZE: 12pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: AR-SA mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl" lang="AR-SA"><span dir="rtl"></span> ،</span><span dir="ltr"></span><span style="FONT-FAMILY: "Times New Roman","serif" FONT-SIZE: 12pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: EN-US mso-ansi-language: EN-US mso-fareast-language: EN-US"><span dir="ltr"></span>(3) highly unsaturated fatty acid (HUFA) + vitamin C-enriched <i>Artemia </i>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 24^ºC) was observed in larvae reared on treatment 3 with 91.34 ± 1.52 percent (P<0.05).</span> Essential fatty acid, vitamin C, Oncorhynchus mykiss, stress resistance, growth and survival 557 569 http://jifro.ir/browse.php?a_code=A-10-1-115&slc_lang=en&sid=1 P. Akbary Paria.akbary@gmail.com 10031947532846001890 10031947532846001890 Yes S. A. Hosseini 10031947532846001891 10031947532846001891 No M. R. Imanpoor 10031947532846001892 10031947532846001892 No