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:: دوره 17، شماره 3 - ( 4-1397 ) ::
جلد 17 شماره 3 صفحات 552-563 برگشت به فهرست نسخه ها
Comparing some biological characteristics of two sturgeons species, Persian sturgeon (Acipenser persicus Borodin, 1897) and Russian sturgeon (A. gueldenstaedtii Brandt & Ratzeburg, 1833) in the Caspian Sea
چکیده:   (488 مشاهده)
The objective of this study was to compare the biological parameters such as length, weight, age, caviar production indices, caviar/weight, condition factor and sex ratio of Persian sturgeon (Acipenser persicus Borodin, 1897) and Russian sturgeon (A. gueldenstaedtii Brandt & Ratzeburg, 1833) in the Caspian Sea during 1990-2014. All these characteristics (except condition factor) of Persian sturgeon were greater than the Russian sturgeon. In the long period, annually average (±SD) fork length ranged from 129.3 (±11.87) to 140.9 (±15.99) cm for Russian sturgeon and 145.7 (±17.61) to 157.4 (±19.31) cm for the Persian sturgeon. The annually caviar harvest for the Russian sturgeon ranged from 3.86 (±1.05) to 5.02 (±1.82) kg with a caviar/weight ratio were ranged from 16.9 (±4.12) to 20.1% (±5.12), while comparatively for the Persian sturgeon was greater and ranged from 4.84 (±1.62) and 7.04 (±2.58) kg with a caviar/weight ratio of 16.2 (±3.99) to 21.1% (±5.20). The age of both species ranged between 6 to 40 years but the modal age of Russian sturgeon was less than Persian sturgeon. The male:female sex ratio of Russian and Persian sturgeons were 0.23:1 and 0.57:1, respectively. The sex ratio of Russian sturgeon was significantly different from sex ratio of Persian sturgeon (p<0.001). The condition factor of Russian and Persian sturgeons were 0.92 (±0.16) and 0.74 (±0.13), respectively. Moreover, results of the MANOVA revealed significant differences in population structure of two species (p<0.001). Therefore, different conservation and management activities need for these two valuable sturgeons in the Caspian Sea.
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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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Tavakoli M, Fazli H, Moghim M, Behrooz Khoshghalb M. Comparing some biological characteristics of two sturgeons species, Persian sturgeon (Acipenser persicus Borodin, 1897) and Russian sturgeon (A. gueldenstaedtii Brandt & Ratzeburg, 1833) in the Caspian Sea. IJFS. 2018; 17 (3) :552-563
URL: http://jifro.ir/article-1-3493-fa.html

Comparing some biological characteristics of two sturgeons species, Persian sturgeon (Acipenser persicus Borodin, 1897) and Russian sturgeon (A. gueldenstaedtii Brandt & Ratzeburg, 1833) in the Caspian Sea. مجله علوم شیلاتی ایران. 1397; 17 (3) :552-563

URL: http://jifro.ir/article-1-3493-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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