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:: دوره 7، شماره 1 - ( 10-1386 ) ::
جلد 7 شماره 1 صفحات 73-86 برگشت به فهرست نسخه ها
Catch composition and fishing trend of kilka in Iranian part of the Caspian Sea
چکیده:   (1219 مشاهده)
Population structure of three kilka fishes (Clupeonella spp.), particularly anchovy kilka (C. engrauliformis), in Iranian waters of the Caspian Sea was surveyed in 2003. A total of 3230 biweekly samples were collected from commercially landed kilka at 3 stations in Mazandaran and Guilan provinces. Catch and effort statistics were obtained from the relevant organization. Results showed a great decline in the commercial kilka catch from 95000 tons in 1999 to 15497 tons in 2003. The contribution of anchovy kilka to the total kilka fishery also showed a decline from 71% in 1999 to 52.5% in 2003, while common kilka (C. cultriventris) increased from 13.7% in 1999 to 48.9% in 2003. Fork length range of anchovy kilka showed an increase from 89.2±12mm in 1999 to 100.4±4.9mm in 2003. The age composition of anchovy ranged between 1+ to 7+ years and the dominant group was 5+ years old (age group of 4+ and 5+ comprised 84.6% of population). The K value and L∞ calculated 0.598/year and 110.13 mm respectively. Natural, fishing and total mortality coefficient was estimated 0.69, 0.31 and 1 per year respectively. The results showed a sex ratio of F: M= 68.2: 31.8.
 
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نوع مطالعه: پژوهشي | موضوع مقاله: Stock assessment
دریافت: ۱۳۹۶/۹/۱۴ | پذیرش: ۱۳۹۶/۹/۱۴ | انتشار: ۱۳۹۶/۹/۱۴
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Sayyad Bourani M, Abdolmalaki S, Khanipour A, Fazli H, Khedmati K. Catch composition and fishing trend of kilka in Iranian part of the Caspian Sea . IJFS. 2008; 7 (1) :73-86
URL: http://jifro.ir/article-1-3083-fa.html

Catch composition and fishing trend of kilka in Iranian part of the Caspian Sea . مجله علوم شیلاتی ایران. 1386; 7 (1) :73-86

URL: http://jifro.ir/article-1-3083-fa.html



دوره 7، شماره 1 - ( 10-1386 ) برگشت به فهرست نسخه ها
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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