Tarbiat Modares University (TMU) ECOPERSIA 2322-2700 1 2 2013 06 01 Stock Management Implication of Caspian kutum (Rutilus frisii kutum Kamensky, 1901) in Iranian Waters of the Caspian Sea 179 190 17089 EN Hasan Fazli Caspian Sea Ecology Research Center, Sari, Iran Gholam Reza Daryanabard Caspian Sea Ecology Research Center, Sari, Iran Shahram Abdolmaleki Inland Water Aquaculture Research Center, Anzali, Iran Gholamali Bandani Inland Water Stocks Research Center, Gorgan, Iran Journal Article Recently the previous Caspian ecosystem is in a catastrophic condition which caused changes in the absolute and relative abundance of the commercially important Caspian kutum (<em>Rutilus frisii kutum</em>) in Iranian waters. The paper presents estimates of yield-per-recruit and spawning biomass-per-recruit under various harvest strategies of <em>F</em>_max, <em>F</em>_0.1, <em>F</em>_30%. It proposes a method for estimating acceptable biological catch (ABC) that accounts for large differences in the quality and quantity of information and available data. The current average Y/R (with <em>F</em>=0.61/y, and <em>t</em>_c=3.2 y) was 218.3 g per recruit, which indicates that the fishery is operating below the maximum Y/R at 236.9 g when <em>t</em>_c= 3.5 y. The Y/R was the highest at <em>F</em>_max and <em>F</em>_0.1, when <em>t</em>_c = 4 y (244.8 g and 214.2 g), respectively. The <em>F</em>_30% value was 0.85/y at <em>t</em>_c of 4 y with the SB/R of 338.3 g. The <em>F</em>_current (0.61/y at current <em>t</em>_c is 3.2 y) is higher than the corresponding reference points, <em>F</em>_0.1(0.47/y) and <em>F</em>_30%(0.46/y). The ABC of kutum was estimated at 7,850 mt in 2009-2010. https://ecopersia.modares.ac.ir/article_17089_d7e81e78801865d4e4c1be615e762ba4.pdf