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:: Volume 4, Issue 1 (6-2016) ::
JAIR 2016, 4(1): 17-27 Back to browse issues page
Determination of growth parameters, Age structure and sex ratio in Broodstock of Roach Rutilus caspicus (Yakovlev, 1870) in the southeastern coast of the Caspian Sea (Golestan Province)
Nikta Mehdipour * , Behzad Saeedpour , Gholamali Bandani
Abstract:   (5038 Views)

The aim of this study was to record growth parameters, age structure and sex ratio of Broodstock of roach (Rutilus caspicus) from East coast of the Caspian Sea. For this purpose, 290 samples were caught by trap (26 mm mesh size) during February 2015 to May 2015. The age rang were 1+ to 4+ years for male and female among which 59.45% of age composition was belonging to year classes of 2+ and 35.75% of age composition was belonging to year classes of 3+. Female to male sex ratio was obtained 1:1.61 which was a significant diference (p= 0/000). Fork length (FL) and weight (W) ranged from 125 to 214.79 and 135 to 270 mm and 29.03 to 188.3 and 43.67 to 293 g for male and female, respectively. The b value of using FL was calculated as 3.039 and 3.197, respectively, and the growth pattern was isometric in the male fish (p>0.05) and positive allometic in the female fish(p< 0.05). Mean of relative weight (Wr) was calculated as 1.016±0.109 and 1.127±0.173 for male and female, respectively, that was differed significantly (p<0/05). Instantaneous growth coefficient (G) was obtained as 0.31 and 0.51 for male and female, respectively. These results showed that environmental condition are not suitable for Broodstock of Roach (Rutilus rutilus caspicus) in southeastern coast of the Caspian Sea and a serious and continuous protection from natural spawning rivers and ponds during migration and spawning season is needed.

Keywords: Broodstock of Roach, R. caspicus, Growth, Age, Southeastern of the Caspian Sea
Full-Text [PDF 472 kb]   (1195 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/08/30 | Accepted: 2015/11/16 | Published: 2016/06/20
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mehdipour N, Saeedpour B, Bandani G. Determination of growth parameters, Age structure and sex ratio in Broodstock of Roach Rutilus caspicus (Yakovlev, 1870) in the southeastern coast of the Caspian Sea (Golestan Province). JAIR 2016; 4 (1) :17-27
URL: http://jair.gonbad.ac.ir/article-1-202-en.html


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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 4, Issue 1 (6-2016) Back to browse issues page
نشریه علمی پژوهشی پژوهشهای ماهی شناسی کاربردی Journal of Applied Ichthyological Research
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