fa Treatment stategies with herbal or others Treatment stategies with herbal or others پژوهشي Original research papers <p style="text-align: justify;">The aim of this study was to determine the effect of propolis and pollen extract on biochemical and haematological parameters of <em>Onchorhynchus &nbsp;mykiss</em>. One hundred and eighty healthy fish, <em>O. mykiss</em> (mean weight 20.57&plusmn;4.48 g) were used for growth performance and haematological assays. They were randomly selected, and distributed among fifteen 600-L fiberglass tanks as three treatments (1% Pollen, 1% Proplils, 0.5% Pollen + 0.5% Proplils as groups 1-3, respectively), negative control as group 4 in triplicates at density of 30 fish each. After 8 weeks of the experiment, which the fish fed supplemented diets, final weight of all treatments showed no significant difference (p> 0.05) as well as WG and DGI. Definitely, all the treatments of the mentioned criteria showed a significant increase (p< 0.05) compared to control group. On the other hand, FCR showed a significance difference (p= 0.00) among the treatments and control so that its value for the group 3 was the minimum one (1.84&plusmn;0.05) and followed by group 2 (2.36&plusmn;0.03). Some criteria containing Hb, RBC, Hct and WBC showed a remarkable increase (p< 0.05) in group 3 compared to other groups while MCV and MCH was significantly lower in group 3 (p< 0.05).</p> herbal medicine, Pollen, Propolis, Onchorhynchus mykiss, haematology 16 25 http://ijaah.ir/browse.php?a_code=A-10-35-42&slc_lang=fa&sid=1 N Choobkar 10031947532846002335 10031947532846002335 Yes Department of Fisheries, Kermanshah branch, , Islamic Azad University, Kermanshah, Iran S Kakoolaki 10031947532846002336 10031947532846002336 No Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran F Mohammadi 10031947532846002337 10031947532846002337 No Department of Veterinary, Kermanshah branch, Islamic Azad University, Kermanshah, Iran M Rezaeimanesh 10031947532846002338 10031947532846002338 No Department of Environment Science, Faculty of Environment, University of Environment, Karaj, Iran