Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea
This study was conducted to determine catch and fishing effort trends, length and age composition, growth and mortality parameters and estimate biomass and acceptable biological catch of Kutum in the Iranian coastal waters of Caspian Sea from 2013 to 2015. The catch of Kutum was 6112.8 and 5599.2 tons and CPUE were 181.1 and 183.5 kg/haul in 2013-2014 and 2014-2015, respectively. The mean (± SD) of fork length were observed 39.4±6.1 and 40.7±5.6 cm and for total weight were 805.1±378.0 and 891.5±384.6 gram in 2013-2014 and 2014-2015, respectively. The most predominated of length class was obtained 40-42 cm and frequency of immature individuals were observed 37.8 and 44.4 percent during two sampling period, respectively. The range of age was from 2 to 11 year and fish with 4 to 6 years comprised up to 84 percent. In length – weight relationship a, b and r2 were calculated 0.011, 3.02 and 0.96 respectively. K value, L∞ and t0 were calculated 0.19 (/year), 61.3 cm and -0.99 respectively. Mortality parameters such as Z, M and F were calculated 0.82, 0.36 and 0.46 respectively and Exploitation rate were calculated 0.56. The biomass of kutum estimated 41000 tons and the acceptable biological catch calculated 8250 to 9750 tons. The biomass of Kutum decreased in recently years in spite of produce and release of huge fingerlings. This recruitment (produce and release fingerlings) must be continued for stability of stocks and fishing stress must be decrease by anyway.
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Format: | Report biblioteca |
Language: | Persian |
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Iranian Fisheries Science Research Institute
2016
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Subjects: | Kutum, Growth, Mortality, Parameters, Biomass, ABC, Age composition, Length, Rutilus frisii kutum, |
Online Access: | http://hdl.handle.net/1834/13805 |
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dig-aquadocs-1834-138052021-05-19T06:52:28Z Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea Daryanabard, Gholam Reza Bagherzadeh Afroozi, F. Taleshian, H. Janbaz, A.A. Rezaei NasrAbad, A. Jamili, Sh. Elyasi, F. Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum This study was conducted to determine catch and fishing effort trends, length and age composition, growth and mortality parameters and estimate biomass and acceptable biological catch of Kutum in the Iranian coastal waters of Caspian Sea from 2013 to 2015. The catch of Kutum was 6112.8 and 5599.2 tons and CPUE were 181.1 and 183.5 kg/haul in 2013-2014 and 2014-2015, respectively. The mean (± SD) of fork length were observed 39.4±6.1 and 40.7±5.6 cm and for total weight were 805.1±378.0 and 891.5±384.6 gram in 2013-2014 and 2014-2015, respectively. The most predominated of length class was obtained 40-42 cm and frequency of immature individuals were observed 37.8 and 44.4 percent during two sampling period, respectively. The range of age was from 2 to 11 year and fish with 4 to 6 years comprised up to 84 percent. In length – weight relationship a, b and r2 were calculated 0.011, 3.02 and 0.96 respectively. K value, L∞ and t0 were calculated 0.19 (/year), 61.3 cm and -0.99 respectively. Mortality parameters such as Z, M and F were calculated 0.82, 0.36 and 0.46 respectively and Exploitation rate were calculated 0.56. The biomass of kutum estimated 41000 tons and the acceptable biological catch calculated 8250 to 9750 tons. The biomass of Kutum decreased in recently years in spite of produce and release of huge fingerlings. This recruitment (produce and release fingerlings) must be continued for stability of stocks and fishing stress must be decrease by anyway. Iranian Fisheries Science Research Institute Published 2018-08-07T11:58:39Z 2018-08-07T11:58:39Z 2016 Report Refereed http://hdl.handle.net/1834/13805 fa 49589; 68pp. Iran Caspian Sea Iranian Fisheries Science Research Institute Tehran, Iran |
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Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum |
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Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum Daryanabard, Gholam Reza Bagherzadeh Afroozi, F. Taleshian, H. Janbaz, A.A. Rezaei NasrAbad, A. Jamili, Sh. Elyasi, F. Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
description |
This study was conducted to determine catch and fishing effort trends, length and age composition, growth and
mortality parameters and estimate biomass and acceptable biological catch of Kutum in the Iranian coastal
waters of Caspian Sea from 2013 to 2015. The catch of Kutum was 6112.8 and 5599.2 tons and CPUE were
181.1 and 183.5 kg/haul in 2013-2014 and 2014-2015, respectively. The mean (± SD) of fork length were
observed 39.4±6.1 and 40.7±5.6 cm and for total weight were 805.1±378.0 and 891.5±384.6 gram in 2013-2014
and 2014-2015, respectively. The most predominated of length class was obtained 40-42 cm and frequency of
immature individuals were observed 37.8 and 44.4 percent during two sampling period, respectively. The range
of age was from 2 to 11 year and fish with 4 to 6 years comprised up to 84 percent. In length – weight
relationship a, b and r2
were calculated 0.011, 3.02 and 0.96 respectively. K value, L∞ and t0 were calculated
0.19 (/year), 61.3 cm and -0.99 respectively. Mortality parameters such as Z, M and F were calculated 0.82, 0.36
and 0.46 respectively and Exploitation rate were calculated 0.56. The biomass of kutum estimated 41000 tons
and the acceptable biological catch calculated 8250 to 9750 tons. The biomass of Kutum decreased in recently
years in spite of produce and release of huge fingerlings. This recruitment (produce and release fingerlings) must
be continued for stability of stocks and fishing stress must be decrease by anyway. |
format |
Report |
topic_facet |
Kutum Growth Mortality Parameters Biomass ABC Age composition Length Rutilus frisii kutum |
author |
Daryanabard, Gholam Reza Bagherzadeh Afroozi, F. Taleshian, H. Janbaz, A.A. Rezaei NasrAbad, A. Jamili, Sh. Elyasi, F. |
author_facet |
Daryanabard, Gholam Reza Bagherzadeh Afroozi, F. Taleshian, H. Janbaz, A.A. Rezaei NasrAbad, A. Jamili, Sh. Elyasi, F. |
author_sort |
Daryanabard, Gholam Reza |
title |
Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
title_short |
Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
title_full |
Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
title_fullStr |
Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
title_full_unstemmed |
Stock assessment of kutum (Rutilus frisii kutum) in the Iranian waters of Caspian Sea |
title_sort |
stock assessment of kutum (rutilus frisii kutum) in the iranian waters of caspian sea |
publisher |
Iranian Fisheries Science Research Institute |
publishDate |
2016 |
url |
http://hdl.handle.net/1834/13805 |
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