اخبار و اعلانات

 آمار

تعداد نشریات283
تعداد نشریات سازمان81
تعداد شماره‌ها2,727
تعداد مقالات31,054
تعداد مشاهده مقاله28,186,224
تعداد دریافت فایل اصل مقاله16,254,624
Gheshlaghi, P., Vahabnezhad, A., Taghavi Motlagh, S. A.. (1390). Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the Southern parts of the Caspian Sea. سامانه مدیریت نشریات علمی, 11(1), 48-62. doi: 10.22092/ijfs.2018.114184
P. Gheshlaghi; A. Vahabnezhad; S. A. Taghavi Motlagh. "Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the Southern parts of the Caspian Sea". سامانه مدیریت نشریات علمی, 11, 1, 1390, 48-62. doi: 10.22092/ijfs.2018.114184
Gheshlaghi, P., Vahabnezhad, A., Taghavi Motlagh, S. A.. (1390). 'Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the Southern parts of the Caspian Sea', سامانه مدیریت نشریات علمی, 11(1), pp. 48-62. doi: 10.22092/ijfs.2018.114184
Gheshlaghi, P., Vahabnezhad, A., Taghavi Motlagh, S. A.. Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the Southern parts of the Caspian Sea. سامانه مدیریت نشریات علمی, 1390; 11(1): 48-62. doi: 10.22092/ijfs.2018.114184

Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the Southern parts of the Caspian Sea

Iranian Journal of Fisheries Sciences
مقاله 5، دوره 11، شماره 1، فروردین 2012، صفحه 48-62    اصل مقاله (993.65 K)
شناسه دیجیتال (DOI): 10.22092/ijfs.2018.114184
نویسندگان
P. Gheshlaghi* ؛ A. Vahabnezhad؛ S. A. Taghavi Motlagh
چکیده
The growth and mortality coefficient of Rutilus frisii kutum, were estimated using length frequency data collected in southern waters of the Caspian Sea during October 2008 to April 2009. The following population parameters were evaluated: length-weight relationship, W = 0.004L 3.258, (r= 0.976) Von Bertalanffy growth constants, W∞ (g) = 4192.3, L∞ (cm) = 70.45, K = 0.2, per year t0 = −0.75 total mortality and its components, Z = 0.92, M = 0.36, F = 0.56 per year. The exploitation rate (E) was estimated about 0.6. The current yield per- recruit was estimated to be 279.15 g, which was only 1.2% less than Maximum yield per recruitment that was estimated as YPRmax = 287.535, it means if fishing mortality increases from 0.56 per year to 0.7 per year, the yield will raise by only 1.2%. The current YPR and maximum YPR, which were gained at fishing mortality of 0.7, showed that most kutum individuals are caught before reaching the length of maturity. Therefore, to get a maximum YPR, it is necessary to increase fishing effort, even higher than the optimum level. Keeping kutum fishing at the current level will permit harvest of the sustainable yield and avoid overfishing problems.
کلیدواژه‌ها
biomass؛ Caspian Sea؛ mortality؛ Rutilus frisii kutum؛ exploitation rate
آمار
تعداد مشاهده مقاله: 148
تعداد دریافت فایل اصل مقاله: 171


counter
سامانه مدیریت نشریات علمی. قدرت گرفته از سیناوب