fa پژوهشي Orginal research papers One of the most visible direct impacts of fishing is the capture of non-target species, known collectively as by-catch. By-catch includes species that are unwanted and discarded (discards) and species that are retained and sold (byproduct) (Stobutzki <em>et al</em>., 2003).<br> &nbsp; By-catch, Tuna, Purse seine, Oman Sea 239 243 http://jifro.ir/browse.php?a_code=A-10-206-5&slc_lang=fa&sid=1 M. Parsa 100319475328460029747 100319475328460029747 No Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran E. Kamrani eza47@gmail.com 100319475328460029748 100319475328460029748 Yes Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran M. Safaei 100319475328460029749 100319475328460029749 No Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran Faculty of Marine Sciences and Technologies, University of Hormozgan, Bandar Abbas, Iran S.Y. Paighambari 100319475328460029750 100319475328460029750 No Environmental and Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran Environmental and Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran T. Nishida 100319475328460029751 100319475328460029751 No National Research Institute of Far Seas Fisheries, Fisheries Research Agency, Shimizu, Shizuoka, Japan National Research Institute of Far Seas Fisheries, Fisheries Research Agency, Shimizu, Shizuoka, Japan