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Age, growth and biomass of the Kutum (Rutilus frisii, Kamensky., 1901) in Iranian waters of the Caspian Sea
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Gh.R. Daryanabard *    1, H. Fazli2 , S.A. Taghavi Motlagh3 , Gh.A. Bandani4 , A. Poorgholami Moghadam5 |
1- Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization, Sari, Iran
2- Caspian Sea Ecology Research Center
3- Iranian Fisheries Science Research Institute
4- Inland Waters Aquatics Resources Research Center
5- Inland Waters Aquaculture Research Center |
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Abstract: (3012 Views) |
This study was conducted to determination length and age composition, growth and mortality parameters and estimate biomass of Kutum in the Iranian coastal waters of the Caspian Sea from 2017 to 2018. The biometrics data were collected from the fishing cooperatives in the Guilan, Mazandaran and Golestan provinces. The mean (± SD) of fork length and total weight were obtained 37.4±6.9 cm and 729.8±418.4 gr respectively. The range of age was from 2 to 11 year and fish with 3 to 4 years comprised up to 73.4 percent. The mean (± SD) of fork length for 3 and 4 age groups were 33.8±5.8 and 39.0±6.2 cm respectively. In length – weight relationship a, b and r2 were calculated 0.012, 2.99 and 0.96. K value, L∞ and t0 were calculated 0.21 (/year), 61.4 cm and -0.54 respectively. Mortality parameters such as Z, M and F were calculated 0.76, 0.36 and 0.36 respectively. The biomass of kutum estimated 27437.7 tons. |
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| Keywords: Kutum, Growth and mortality parameters, Biomass, Caspian Sea |
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Full-Text [PDF 824 kb]
(749 Downloads)
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Type of Study: Research |
Subject:
ارزيابي ذخاير و پويايي جمعيت
Received: 2019/05/14 | Accepted: 2019/07/28 | Published: 2019/09/8
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