University of Guilan Aquatic Physiology and Biotechnology 2345-3966 6 2 2018 09 22 The effect of monsoon on physiological stress indicators of Chabahar bay (Oman Sea) Bivalvia Azumapecten ruschenbergerii (Tryon, 1869) under laboratory condition The effect of monsoon on physiological stress indicators of Chabahar bay (Oman Sea) Bivalvia Azumapecten ruschenbergerii (Tryon, 1869) under laboratory condition 23 44 3028 10.22124/japb.2018.6630.1137 FA Mohammad Mansour Toutouni Assistant Professor in Marine Biology Department, Faculty of Marine Science, Chabahar Maritime University, Chabahar, Iran Ahmad Savari Professor in Marine Biology Department, Faculty of Marine and Ocean Science, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran Babak Doustshenas Associate Professor in Marine Biology Department, Faculty of Marine and Ocean Science, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran Nasrin Sakhaei Associate Professor in Marine Biology Department, Faculty of Marine and Ocean Science, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran Danial Azhdari Assistant Professor of Iranian Fisheries Science Research Institute, Chabahar, Iran Journal Article 2017 10 11 Environmental quality assessments recommend use of sessile invertebrates. Because, they are unable to escape from environmental deterioration. In addition, the ability of adaptive responses to such environmental change, would determine its survival and reproduction potential. The organism adaptability may therefore be defined by its capacity to adjust the physiology to operate with optimal efficiency in a variable environment. Indicators that are discussed in this field for <em>Azumapecten ruschenbergerii</em>, at the Chabahar Bay and in the time before and after the monsoon, include: the ratio of consumed oxygen to excreted nitrogen and body condition index. The first is widely used to study the metabolism of animals. The second is the occupied space of internal volume of the shell by the body. Accordingly, stress indices were determined and statistically evaluated. The average of both indices was associated with significant changes (increase for the first and decrease for the second one) in relation to pre- and post-monsoon period (P<0.05). Evaluating both indicators suggests less environmental stress in the post-monsoon period to this bivalve living in sampling sites Environmental quality assessments recommend use of sessile invertebrates. Because, they are unable to escape from environmental deterioration. In addition, the ability of adaptive responses to such environmental change, would determine its survival and reproduction potential. The organism adaptability may therefore be defined by its capacity to adjust the physiology to operate with optimal efficiency in a variable environment. Indicators that are discussed in this field for <em>Azumapecten ruschenbergerii</em>, at the Chabahar Bay and in the time before and after the monsoon, include: the ratio of consumed oxygen to excreted nitrogen and body condition index. The first is widely used to study the metabolism of animals. The second is the occupied space of internal volume of the shell by the body. Accordingly, stress indices were determined and statistically evaluated. The average of both indices was associated with significant changes (increase for the first and decrease for the second one) in relation to pre- and post-monsoon period (P<0.05). Evaluating both indicators suggests less environmental stress in the post-monsoon period to this bivalve living in sampling sites https://japb.guilan.ac.ir/article_3028_abfd5e13019bc29180d61f3380298493.pdf