en aquaculture aquaculture پژوهشي Orginal research papers <font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0cm 0cm 0pt text-align: justify line-height: 120% text-autospace: mso-layout-grid-align: none"><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt">Co-feeding of fish larvae with live food and formulated diet has been at the focus of fish nutritionists since last decade. In this study we tried to refine the feeding practices of great beluga sturgeon (<i>Huso huso</i>) larvae using different combinations of newly hatched <i>Artemia urmiana</i> nauplii and trout starter diet. </span><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt mso-fareast-font-family: "Times New Roman"">Three replicate groups (250 fish/replicate) of first-feeding </span><i><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt">Huso huso</span></i><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt"> larvae</span><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt mso-fareast-font-family: "Times New Roman""> were fed on the basis of four main feeding regimens: (1) live food (live nauplii of brine shrimp <i>Artemia</i> <i>urmiana</i>) (2) indirect transition (5 days live food followed by gradual transition to formulated diet) (3) direct transition (using different combinations of live and formulated diet from start feeding) (4) formulated feed (FD). </span><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt">It was found that combining live food and manufactured diets (co-feeding) from first feeding stage (direct transition) significantly improves the weight gain in <i>H. huso</i> larvae followed by indirect transition, live food and FD. But survival was significantly higher in larvae fed on pure live food and direct transition regimens compared to indirect transition and FD. </span><span style="line-height: 120% font-family: "Times New Roman","serif" font-size: 12pt mso-fareast-font-family: "Times New Roman"">It was concluded that co-feeding of <i>H. huso</i> could be started immediately from commencement of exogenous feeding.<o:p /></span></p><font face="Times New Roman" size="3"> </font> Huso huso, Artemia nauplii, Formulated diet, Co-feeding, Growth, Survival 713 723 http://jifro.ir/browse.php?a_code=A-10-1-193&slc_lang=en&sid=1 N. Agh agh@urmia.ac.ir 10031947532846004972 10031947532846004972 Yes F. Noori 10031947532846004973 10031947532846004973 No N. M. Makhdom 10031947532846004974 10031947532846004974 No