University of Guilan Caspian Journal of Environmental Sciences 1735-3033 19 1 2021 01 01 Length-weight relationship, condition factor and relative condition factor of Alosa braschnikowi and A. caspia in the southeast of the Caspian Sea (Goharbaran) 105 113 4501 10.22124/cjes.2021.4501 EN Hasan Fazli Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Gholamreza Daryanabard Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Mehdi Naderi Jolodar Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Hassan Mollaei Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Hosein Taleshian Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Faramarz Bagherzadeh Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran Journal Article 2021 01 10 The main objectives of the present study were to determine the species composition of Caspian shad, genus <em>Alosa </em>and to estimate the LWR, CF, and Kn of <em>A. braschnikowi</em> and <em>A. caspia</em> during different months in the southeastern coast of the Caspian Sea. Two fishing methods, small mesh size beach seine and gillnet were used from December 2013 through July 2014. <em>A. braschnikowi</em> and <em>A. caspia</em>, were distinguished in the southeastern part of the Caspian Sea (Goharbaran), consisting of 57.1% and 42.9% of the Alosa catch, respectively. The slopes (b values) of the length-weight regression were 3.241 and 2.844 which were significantly different from 3 (P<0.05), indicating positive and negative allometric growth, respectively. The average CF of <em>A. braschnikowi</em> and <em>A. caspia</em> were calculated as 0.72 ± 0.12 and 0.83 ± 0.13, respectively. The average CF for both species were significantly different among months (P<0.001). There was a significantly negative correlation between size classes and CF of <em>A. caspia</em>. The Kn was greater than 1 for <em>A. braschnikowi</em> and lower than 1 for <em>A. caspia</em> indicating good well-being of <em>A. braschnikowi</em> as opposed to <em>A. caspia</em> in the southeastern Caspian Sea. https://cjes.guilan.ac.ir/article_4501_42a4c27df4f3f9fbf07673530696d5a3.pdf