en Economy in fishery Economy in fishery پژوهشي Orginal research papers <span style="font-size:11pt"><span style="line-height:120%"><span style="font-family:Calibri,sans-serif"><span lang="EN-GB" style="font-size:12.0pt"><span style="line-height:120%"><span new="" roman="" style="font-family:" times=""><span style="color:black">This study combined socio-economic data with long time series data for Kilka species&#39; annual catch and effort from 2003 to 2017, in the Iranian waters of the Caspian Sea. This analysis was conducted to estimate maximum sustainable yield, maximum economic yield, and their respective effort levels to manage and exploit the Kilka spices in a sustainable manner. According to our estimation, MSY was 22850 t, with a total income of $5587715 at an effort value (fmsy) of 9498 vessel night. The figure for MEY were 21988 t, with a total income of $5376847 with a substantially lower fishing effort value (fmey) of 7653 vessel night. Comparing the landing of Kilka, in 2017 (22602 tonnes) with the results of the surplus production model analysis, it is suggested that in order to conserve stocks of common Kilka, it is necessary to decrease the level of catch and fishing efforts based on the results of the present study</span></span></span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:120%"><span new="" roman="" style="font-family:" times=""><span style="color:black">.</span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:200%"><span style="font-family:Calibri,sans-serif"><span lang="EN-GB" style="font-size:12.0pt"><span style="line-height:200%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:200%"><span style="font-family:Calibri,sans-serif"><span lang="EN-GB" style="font-size:12.0pt"><span style="line-height:200%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span></span> Kilka fishery, MSY, MEY, fmsy, fmey, Caspian Sea 785 797 http://jifro.ir/browse.php?a_code=A-10-86-6&slc_lang=en&sid=1 S.A. Taghavimotlagh s_taghavimotlagh@hotmail.com 100319475328460046395 100319475328460046395 Yes Iranian Fisheries Science Research Institute (IFSRI), Agriculture Research Education and Extension Organization (AREEO), Tehran. Iran G.R. Daryanabard 100319475328460046396 100319475328460046396 No Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran, A. Vahabnezhad avn9400@gmail.com 100319475328460046397 100319475328460046397 No Iranian Fisheries Science Research Institute (IFSRI), Agriculture Research Education and Extension Organization (AREEO), Tehran. Iran