en aquaculture aquaculture پژوهشي Orginal research papers <span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">In this study, the malondialdehyde (MDA) levels in the muscle, liver and kidney tissues and the antioxidant vitamin (A, C, E) levels in the muscle tissue of juvenile rainbow trout were investigated under different oxygen levels (3.5 mg O₂/l, 4.5 mg O₂/l and 7 mg O₂/l)<font size="3"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>at the end of the 8 hour trial.</font></font></span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US"> </span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">Fish (initial weight and length, 30.19±2.2 <font size="3"><font face="Times New Roman"><span class="hps"><span style="color: black">g</span></span><span style="color: black"> <span class="hps">and </span></span>13.15±0.22 <span class="hps"><span style="color: black">cm</span></span>, respectively) were distributed into 9 fiberglass rectangular tanks. </font></font></span><span lang="EN-GB" style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US">The highest MDA level of all tissues was obtained in </span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">3.5 mg O₂/l</span><span lang="EN-GB" style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US"> (p<0.05). Different oxygen levels did not affect muscle vitamin A concentration statically (p>0.05). But the highest muscle vitamin C and E<font size="3"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>concentrations were obtained in </font></font></span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">7 mg O₂/l.</span><span lang="EN-GB" style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US"> (p<0.05), followed by 3.5 </span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">mg O₂/l</span><span lang="EN-GB" style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US">, while the lowest muscle vitamin C concentration was obtained in 4.5 </span><span style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-US mso-fareast-language: EN-US">mg O₂/l.</span><span lang="EN-GB" style="line-height: 115% font-family: "Times New Roman","serif" font-size: 12pt mso-bidi-language: AR-SA mso-fareast-font-family: Calibri mso-ansi-language: EN-GB mso-fareast-language: EN-US"> (p<0.05). </span> 315 324 http://jifro.ir/browse.php?a_code=A-10-1-158&slc_lang=en&sid=1 G. Tuna Keleştemur gkelestemur@firat.edu.tr 10031947532846003201 10031947532846003201 Yes