en Aquaculture and Health management Aquaculture and Health management پژوهشي Original research papers <div style="text-align: justify;">One of the most important and influential stress causing problem and secondary diseases in fish is transport stress. The aim of this study was to evaluate the physiological effects of acute stress of fish transportation on some biochemicals in <em>Salmo trutta caspius</em>. A total of 100 fish were transported in plastic bags for 6 h and then released in 300-l tanks. Blood samples were taken after 6, 12, 24 and 48 h after a 6-h transportation (n=15). Based on the results, blood glucose increased compared to the basal value (p<0.05) after 6 h but the value was decreased at 12 and 24 h compared to that of 6 h. Cortisol value was increased significantly (p<0.05) in all sampling times. &nbsp;Unexpectedly, protein content was significantly increased (p<0.05) at 24h. On the other hands, other parameters uch as Na⁺, Cl^-, K⁺, did not show a significant&nbsp; variation after transportation (p>0.05).</div> Salmo trutta caspius, stress, transport, blood, biochemical 54 62 http://ijaah.ir/browse.php?a_code=A-10-304-1&slc_lang=en&sid=1 R. Kazempoor r.kazempoor@riau.ac.ir 10031947532846002504 10031947532846002504 Yes Department of Biology, Roudehen Branch, Islamic Azad University, Roudehen, Iran S. Sh. Alavinezhad r.kazempoor@riau.ac.ir 10031947532846002505 10031947532846002505 No Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran