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:: دوره 17، شماره 3 - ( 4-1397 ) ::
جلد 17 شماره 3 صفحات 443-457 برگشت به فهرست نسخه ها
Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River
چکیده:   (761 مشاهده)
The relationship between the Lower Danube River level and Romanian annual catches of Pontic shad (Alosa immaculata, Bennett 1835) were analyzed. For analysis of long term data on the Danube River water level and Pontic shad catch, combinations of different methods were applied using statistical programs, SPSS 13.0 and MATLAB 6. Periodograms, containing cyclic patterns, were obtained using Fourier analysis. Significant oscillations were determined with Fisher-Whittle’s tests and residuals were calculated after subtracting these significant oscillations from the original signals. Autoregressive moving average (ARMA) models of residuals were finally applied. Results indicated that river water levels, and especially those in May, greatly explained the fluctuations of Pontic shad catch. Annual landings varied greatly and appeared to be cyclic. Varying river flow was considered to be one of the most important factors that cause fluctuations in the size of populations. Forecast indicates gradual increase of the catch in the next decade, followed by a decrease in other decades. Estimated as a vulnerable species of fish by the IUCN, development of the forecasting model of the future catch oscillations could be very helpful to regulate fishing efforts towards the sustainable use of stocks and species conservation.
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نوع مطالعه: پژوهشي | موضوع مقاله: Biology & physiology
دریافت: ۱۳۹۷/۴/۱۱ | پذیرش: ۱۳۹۷/۴/۱۱ | انتشار: ۱۳۹۷/۴/۱۱
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Smederevac-Lalić M, Kalauzi A, Regner S, Navodaru I, Višnjić-Jeftić Ž, Gačić Z et al . Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River. IJFS. 2018; 17 (3) :443-457
URL: http://jifro.ir/article-1-3486-fa.html

Analysis and forecast of Pontic shad (Alosa immaculata) catch in the Danube River. مجله علوم شیلاتی ایران. 1397; 17 (3) :443-457

URL: http://jifro.ir/article-1-3486-fa.html



دوره 17، شماره 3 - ( 4-1397 ) برگشت به فهرست نسخه ها
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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