en Aquaculture and Health management Aquaculture and Health management پژوهشي Original research papers <div style="text-align: justify;">One hundred and fifty stellate sturgeon (<em>Acipenser stellatus</em>, 250 &plusmn; 3.24 g) were assembled into 15 round concrete tanks. The tanks were allocated to five treatments with three replications: fed with a diet containing 30% protein for eight weeks (T1); fed with a diet containing 30% protein level in weeks 1, 3, 5, and 7 and fed with a diet containing 35% protein level in weeks 2, 4, 6, and 8 (T2); fed with a diet containing 30% protein in weeks 1, 2, 5, and 6, and fed with a diet containing 35% protein in weeks 3, 4, 7, and 8 (T3); fed with a diet containing 30% in the diet in weeks 1, 2, 3, and 4, and fed with a diet containing of 35% protein in weeks 5, 6, 7, and 8 (T4); and fed with a diet containing 35% for eight weeks (T5). Remarkable effects were recorded in growth efficiency, and T2 and T5 had higher growth than other treatments. No marked difference was seen in the whole body composition. Different feeding strategies affected RBC, WBC, and MCV, and RBC and WBC of fish in the T4 were notably upper than in the other groups. Different feeding strategies had marked differences in lysozyme and ACH50 activity. These results demonstrated that T2 could use as a feeding strategy for stellate sturgeon.<br> &nbsp;</div> Stellate sturgeon, Feeding strategy, Protein restriction time 20 30 http://ijaah.ir/browse.php?a_code=A-10-383-1&slc_lang=en&sid=1 S. A. A Bagheri Khamkhane aa_bagheri61@yahoo.com 10031947532846002981 10031947532846002981 Yes Shahid Rajaee Sturgeon Hatchery Center, Sari, Mazandaran, Iran A Ehsanfar atena60eh@gmail.com 10031947532846002982 10031947532846002982 No Shahid Rajaee Sturgeon Hatchery Center, Sari, Mazandaran, Iran S. S Mirkhataminasab Langerodi shokofehkhatami150@gmail.com 10031947532846002983 10031947532846002983 No Islamic Azad University of Lahijan, Lahijan, Guilan, Iran A Keramat keramat@yahoo.com 10031947532846002984 10031947532846002984 No Fisheries Department, Faculty of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran H Oraji ouraji@yahoo.com 10031947532846002985 10031947532846002985 No Fisheries Department, Faculty of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran A Abedian kenari abediankenari@yahoo.com 10031947532846002986 10031947532846002986 No Department of Aquaculture, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Mazandaran, Iran