Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea
Caspian roach (Rutilus caspius), is one of the most important commercial species in the Caspian Sea with a high level of catch fluctuations over the past decades mainly due to overfishing. In this study, data from 246 specimens caught from beach seine cooperative companies in the southeast coast of...
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| Format: | Article |
| Language: | fas |
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Iranian Fisheries Research Organization
2018-01-01
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| Series: | Majallah-i ̒Ilmī-i Shīlāt-i Īrān |
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| Online Access: | http://isfj.areo.ir/article_117721_en.html |
| _version_ | 1828529966858371072 |
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| author | R. dordi Tatr; R. Ghorbani; S. Gorgin; Gh. Bandani; M. Yahyaei |
| author_facet | R. dordi Tatr; R. Ghorbani; S. Gorgin; Gh. Bandani; M. Yahyaei |
| author_sort | R. dordi Tatr; R. Ghorbani; S. Gorgin; Gh. Bandani; M. Yahyaei |
| collection | DOAJ |
| description | Caspian roach (Rutilus caspius), is one of the most important commercial species in the Caspian Sea with a high level of catch fluctuations over the past decades mainly due to overfishing. In this study, data from 246 specimens caught from beach seine cooperative companies in the southeast coast of the Caspian Sea during the October 2014- April 2015 were analyzed. Results showed that the fish age were ranged between 3 to 10 years with fork lengths and weights ranging 14.5-32.1 cm and 70.7-437 g, respectively. The growth parameters of the von Bertalanffy equation were found as Lt=41.8 [1-e–0.12(t+0.766)]. The length-weight relationships were estimated to be WT= 0.0208 FL2.9184 (R2 =0.901) for females and WT= 0.0138 FL3.0244 (R2 =0.921) for males. Weight increased isometrical with the fork length for females and males. Total mortality, natural and fishing coefficients (Z, M, F) and exploitation rate (E) were estimated to be 1.239, 0.324, 0.916 year-1 and 0.74, respectively. Fish biomass and maximum sustainable yield (MSY) were equal to 417 Kg and 215 Kg, while the ration of cooperative companies catch was 28 Kg. Therefore, it is suggested that the Caspian roach stocks are severely exposed to overfishing, and there is an urgent need to efficient management for stock conversation |
| first_indexed | 2024-12-11T22:16:29Z |
| format | Article |
| id | doaj.art-849f91b9c21340a9993b40e6b043ce35 |
| institution | Directory Open Access Journal |
| issn | 1026-1354 2322-5998 |
| language | fas |
| last_indexed | 2024-12-11T22:16:29Z |
| publishDate | 2018-01-01 |
| publisher | Iranian Fisheries Research Organization |
| record_format | Article |
| series | Majallah-i ̒Ilmī-i Shīlāt-i Īrān |
| spelling | doaj.art-849f91b9c21340a9993b40e6b043ce352022-12-22T00:48:36ZfasIranian Fisheries Research OrganizationMajallah-i ̒Ilmī-i Shīlāt-i Īrān1026-13542322-59982018-01-012746776Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian SeaR. dordi Tatr; R. Ghorbani; S. Gorgin; Gh. Bandani; M. YahyaeiCaspian roach (Rutilus caspius), is one of the most important commercial species in the Caspian Sea with a high level of catch fluctuations over the past decades mainly due to overfishing. In this study, data from 246 specimens caught from beach seine cooperative companies in the southeast coast of the Caspian Sea during the October 2014- April 2015 were analyzed. Results showed that the fish age were ranged between 3 to 10 years with fork lengths and weights ranging 14.5-32.1 cm and 70.7-437 g, respectively. The growth parameters of the von Bertalanffy equation were found as Lt=41.8 [1-e–0.12(t+0.766)]. The length-weight relationships were estimated to be WT= 0.0208 FL2.9184 (R2 =0.901) for females and WT= 0.0138 FL3.0244 (R2 =0.921) for males. Weight increased isometrical with the fork length for females and males. Total mortality, natural and fishing coefficients (Z, M, F) and exploitation rate (E) were estimated to be 1.239, 0.324, 0.916 year-1 and 0.74, respectively. Fish biomass and maximum sustainable yield (MSY) were equal to 417 Kg and 215 Kg, while the ration of cooperative companies catch was 28 Kg. Therefore, it is suggested that the Caspian roach stocks are severely exposed to overfishing, and there is an urgent need to efficient management for stock conversationhttp://isfj.areo.ir/article_117721_en.htmlGrowth parameters; Southeast of the Caspian Sea; biomass; Rutilus caspius |
| spellingShingle | R. dordi Tatr; R. Ghorbani; S. Gorgin; Gh. Bandani; M. Yahyaei Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea Majallah-i ̒Ilmī-i Shīlāt-i Īrān Growth parameters; Southeast of the Caspian Sea; biomass; Rutilus caspius |
| title | Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea |
| title_full | Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea |
| title_fullStr | Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea |
| title_full_unstemmed | Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea |
| title_short | Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea |
| title_sort | assessing exploitation status of caspian roach rutilus caspicus yakovlev 1870 in southeast of the caspian sea |
| topic | Growth parameters; Southeast of the Caspian Sea; biomass; Rutilus caspius |
| url | http://isfj.areo.ir/article_117721_en.html |
| work_keys_str_mv | AT rdorditatrrghorbanisgorginghbandanimyahyaei assessingexploitationstatusofcaspianroachrutiluscaspicusyakovlev1870insoutheastofthecaspiansea |