The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea
There are 3 species of kilka in the Caspian Sea consist Of: Clupeonella engrauliformis, C. grimmi and C. cultriventris. These species are caught by fishing method of tunnel net with underwater light in the inshore waters (depths of 40-100m). The maximum recorded catch for three species in the Iranian waters had been 85000 tons per year during period of 1998-99. In the next years (2000-2001) despite of increasing the effort, the amount catch was dropped drastically. The result or collected commercial catch data showed that there are some changes in kilka catch compositions and also the frequency of common kilka has been increased since 1998. On the other hand, this species was a main part of commercial catch composition during all months. Meanwhile in the previous years, they were observed only during warm seasons (spring and summer). Based on fishermen and personal observations, the transparency of sea Water Was decreased rapidly during the years of 1999-2000 and at that time there were found a high abundance of Mnemiopsis leidyi in commercial catches. Simultaneously, with an increase in the mass of Mnemiopsis leidyi, the amount of catch and CPLUE or kilka have been sharply decreased.
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Format: | article biblioteca |
Language: | Persian |
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2002
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Subjects: | Fisheries, Mnemiopsis leidyi, Kilka, Southern Caspian Sea, Iran, |
Online Access: | http://hdl.handle.net/1834/38750 |
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dig-aquadocs-1834-387502021-07-15T02:40:36Z The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea Fazli, H. Roohi, A. Fisheries Mnemiopsis leidyi Kilka Southern Caspian Sea Iran There are 3 species of kilka in the Caspian Sea consist Of: Clupeonella engrauliformis, C. grimmi and C. cultriventris. These species are caught by fishing method of tunnel net with underwater light in the inshore waters (depths of 40-100m). The maximum recorded catch for three species in the Iranian waters had been 85000 tons per year during period of 1998-99. In the next years (2000-2001) despite of increasing the effort, the amount catch was dropped drastically. The result or collected commercial catch data showed that there are some changes in kilka catch compositions and also the frequency of common kilka has been increased since 1998. On the other hand, this species was a main part of commercial catch composition during all months. Meanwhile in the previous years, they were observed only during warm seasons (spring and summer). Based on fishermen and personal observations, the transparency of sea Water Was decreased rapidly during the years of 1999-2000 and at that time there were found a high abundance of Mnemiopsis leidyi in commercial catches. Simultaneously, with an increase in the mass of Mnemiopsis leidyi, the amount of catch and CPLUE or kilka have been sharply decreased. 2021-06-24T18:14:02Z 2021-06-24T18:14:02Z 2002 article TRUE 1026-1354 http://hdl.handle.net/1834/38750 fa http://www.ifro.ir application/pdf application/pdf 63-72 http://aquaticcommons.org/id/eprint/24053 18721 2018-08-03 07:06:16 24053 Iranian Fisheries Science Research Institute |
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Fisheries Mnemiopsis leidyi Kilka Southern Caspian Sea Iran Fisheries Mnemiopsis leidyi Kilka Southern Caspian Sea Iran Fazli, H. Roohi, A. The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
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There are 3 species of kilka in the Caspian Sea consist Of: Clupeonella engrauliformis, C. grimmi and C. cultriventris. These species are caught by fishing method of tunnel net with underwater light in the inshore waters (depths of 40-100m). The maximum recorded catch for three species in the Iranian waters had been 85000 tons per year during period of 1998-99. In the next years (2000-2001) despite of increasing the effort, the amount catch was dropped drastically. The result or collected commercial catch data showed that there are some changes in kilka catch compositions and also the frequency of common kilka has been increased since 1998. On the other hand, this species was a main part of commercial catch composition during all months. Meanwhile in the previous years, they were observed only during warm seasons (spring and summer). Based on fishermen and personal observations, the transparency of sea Water Was decreased rapidly during the years of 1999-2000 and at that time there were found a high abundance of Mnemiopsis leidyi in commercial catches. Simultaneously, with an increase in the mass of Mnemiopsis leidyi, the amount of catch and CPLUE or kilka have been sharply decreased. |
format |
article |
topic_facet |
Fisheries Mnemiopsis leidyi Kilka Southern Caspian Sea Iran |
author |
Fazli, H. Roohi, A. |
author_facet |
Fazli, H. Roohi, A. |
author_sort |
Fazli, H. |
title |
The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
title_short |
The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
title_full |
The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
title_fullStr |
The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
title_full_unstemmed |
The impacts of Mnemiopsis leidyi on kilka resources in the southern Caspian Sea |
title_sort |
impacts of mnemiopsis leidyi on kilka resources in the southern caspian sea |
publishDate |
2002 |
url |
http://hdl.handle.net/1834/38750 |
work_keys_str_mv |
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