:: Volume 17, Issue 3 (7-2018) ::
IJFS 2018, 17 Back to browse issues page
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
M. Tavakoli * , H. Fazli , M. Moghim , M.R. Behrooz Khoshghalb
, m_tavakoli_e@yahoo.com
Abstract:   (451 Views)
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.
Keywords: Acipenser persicus, Acipenser gueldenstaedtii, Age, Length, Weight, Sex, Caspian Sea
Full-Text [PDF 368 kb]   (169 Downloads)    
Type of Study: Orginal research papers | Subject: Biology & physiology
Received: 2018/07/2 | Accepted: 2018/07/2 | Published: 2018/07/2


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Volume 17, Issue 3 (7-2018) Back to browse issues page