en Biology & physiology Biology & physiology پژوهشي Orginal research papers <p><span style="font-size:10pt"><span style="text-justify:inter-ideograph"><span style="line-height:120%"><span new="" roman="" style="font-family:" times=""><span lang="TR" style="font-size:12.0pt"><span style="line-height:120%"><span style="color:black">In order to explore the influence of increased salinization on fish populations in Tarim River, sodium chloride (NaCl) salinity tolerance in <i>T. yarkandensis </i>(a native fish species), was measured in laboratory by applying slow acclimation (SA, gradual salinity increase) and direct transfer (DT) methods in spring season. Whereas Probit method was used to calculate the median lethal concentration (LC₅₀). Results of slow acclimation for adult, juvenile and larva fish (LC₅₀) showed 16.51 g/L, 12.94 g/L and 8.13 <a>g/L</a></span></span></span><span lang="TR" style="font-size:8.0pt"><span style="line-height:120%"><span style="color:black"><a class="msocomanchor" href="#_msocom_1" id="_anchor_1" language="JavaScript" name="_msoanchor_1" on<illegal tag>mouseout="msoCommentHide('_com_1')" on<illegal tag>mouseover="msoCommentShow('_anchor_1','_com_1')">[cy1]</a>&nbsp;</span></span></span><span lang="TR" style="font-size:12.0pt"><span style="line-height:120%"><span style="color:black">, respectively. Results of salinity tolerance (LC₅₀) by DT method, were recorded as 16.16 g/L, 11.01 g/L, and 7.37 g/Lfor adult, juvenile and larva, respectively. The salinity tolerance of the fish showed age-dependent increasing tendency. The experiments have also been conducted in three other seasons to study the relationship between salinity tolerance of adults and seasonal salinity variances in Tarim River. Results showed a significant S relationship between river&rsquo;s salinity and the LC₅₀ of adults (data mixed the SA and DT) by using equations y=e^{2.788-0.121/X}(R²=0.994, P=0.003) for DT, and y=e^{2.771-0.120/X}(R²=0.927,P=0.037) for SA. These findings suggest that <i>T. yarkandensis </i>has a physiological adaptation for osmoregulation in developmental processes and in dealing with the seasonal salinity variances of the Tarim River.</span></span></span></span></span></span></span></p> <div> <hr align="left" class="msocomoff" size="1" width="33%" > <div><div class="msocomtxt" id="_com_1" language="JavaScript" on<illegal tag>mouseout="msoCommentHide('_com_1')" on<illegal tag>mouseover="msoCommentShow('_anchor_1','_com_1')"></div></div> </div> Triplophysa Yarkandensis, Salinity tolerance, Tarim River, Age, Seasonal variances 1156 1165 http://jifro.ir/browse.php?a_code=A-10-1941-1&slc_lang=en&sid=1 W. Zhichao wangzhichao@taru.edu.cn 100319475328460046569 100319475328460046569 No Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Key Laboratory of Animal Husbandry Science and Technology of Xinjiang Production & Construction Corps，College of Life Science, Tarim University, Alar,843300, China W. Xiaolei wangxl@126.com 100319475328460046570 100319475328460046570 No Shandong First Medical University, Tai’an, 271016, China W. Junyuan 67785053@qq.com 100319475328460046571 100319475328460046571 Yes Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Key Laboratory of Animal Husbandry Science and Technology of Xinjiang Production & Construction Corps，College of Life Science, Tarim University, Alar,843300, China K. Benno Benno.Kuegel@wwa-in.bayern.de 100319475328460046572 100319475328460046572 No Catholic University Eichstätt-Ingolstadt, Eichstätt, 85072, German R. Daoquan rdqdky@126.com 100319475328460046573 100319475328460046573 No Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Key Laboratory of Animal Husbandry Science and Technology of Xinjiang Production & Construction Corps，College of Life Science, Tarim University, Alar,843300, China Y. Cuifang 420084752@qq.com 100319475328460046574 100319475328460046574 No College of Information Engineering, Tarim University, Alar, 843300, China