The role of restocking bream for improvement of the natural stock
Abramis brama orientalis is a valuable fish species in the Caspian Sea. Its stock after has been faced with pronounced depletion since 1941. The release of millions of its fry have not been successful to restore its stock. A slim fluctuation were observed in its natural stocks during last seven years in the Iranian coastal areas. In comparison to 1992-1993, catch showed a 4.4 tons increment in 1998-99. No pronounced increase was observed considering release of 70.46 million fry during mentioned period. Young and immature fish provide main part of the catch while mature individuals provided a small part of it during 1978-1979. For most rate of catch comprised by young and immature fish and the number of brood-stock fish were very small amount in the catch as in the year of 1998-1999, 20.3% of catch formed by one year old fish and 37.3% by two years old. The average length, weight and age of bream in the years of 1998-99 calculated 22.5cm, 212.2gr and 2.4 years respectively. The depletion of the stock could be attributed to the following important cases, such as non-rational catch practicing, environmental, pollution, destruction of natural spawning grounds, the existence of predatory fish for example Pike and Sheatfish in fries unloading site, and lack of necessary arrangement relevant to artificial spawning. The rate of recruitment of Bream to fisheries calculated 4.6% in 1991 and 2.7% in 1992.
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Format: | article biblioteca |
Language: | Persian |
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2001
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Subjects: | Aquaculture, Releasing, Abramis brama orientalis, Caspian Sea, Iran, |
Online Access: | http://hdl.handle.net/1834/38711 |
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dig-aquadocs-1834-387112021-07-15T02:37:03Z The role of restocking bream for improvement of the natural stock Saiad Borani, M. Aquaculture Releasing Abramis brama orientalis Caspian Sea Iran Abramis brama orientalis is a valuable fish species in the Caspian Sea. Its stock after has been faced with pronounced depletion since 1941. The release of millions of its fry have not been successful to restore its stock. A slim fluctuation were observed in its natural stocks during last seven years in the Iranian coastal areas. In comparison to 1992-1993, catch showed a 4.4 tons increment in 1998-99. No pronounced increase was observed considering release of 70.46 million fry during mentioned period. Young and immature fish provide main part of the catch while mature individuals provided a small part of it during 1978-1979. For most rate of catch comprised by young and immature fish and the number of brood-stock fish were very small amount in the catch as in the year of 1998-1999, 20.3% of catch formed by one year old fish and 37.3% by two years old. The average length, weight and age of bream in the years of 1998-99 calculated 22.5cm, 212.2gr and 2.4 years respectively. The depletion of the stock could be attributed to the following important cases, such as non-rational catch practicing, environmental, pollution, destruction of natural spawning grounds, the existence of predatory fish for example Pike and Sheatfish in fries unloading site, and lack of necessary arrangement relevant to artificial spawning. The rate of recruitment of Bream to fisheries calculated 4.6% in 1991 and 2.7% in 1992. 2021-06-24T18:13:49Z 2021-06-24T18:13:49Z 2001 article TRUE 1026-1354 http://hdl.handle.net/1834/38711 fa http://www.ifro.ir application/pdf application/pdf 27-38 http://aquaticcommons.org/id/eprint/24012 18721 2018-08-02 16:43:56 24012 Iranian Fisheries Science Research Institute |
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Abramis brama orientalis is a valuable fish species in the Caspian Sea. Its stock after has been faced with pronounced depletion since 1941. The release of millions of its fry have not been successful to restore its stock. A slim fluctuation were observed in its natural stocks during last seven years in the Iranian coastal areas. In comparison to 1992-1993, catch showed a 4.4 tons increment in 1998-99. No pronounced increase was observed considering release of 70.46 million fry during mentioned period. Young and immature fish provide main part of the catch while mature individuals provided a small part of it during 1978-1979. For most rate of catch comprised by young and immature fish and the number of brood-stock fish were very small amount in the catch as in the year of 1998-1999, 20.3% of catch formed by one year old fish and 37.3% by two years old. The average length, weight and age of bream in the years of 1998-99 calculated 22.5cm, 212.2gr and 2.4 years respectively. The depletion of the stock could be attributed to the following important cases, such as non-rational catch practicing, environmental, pollution, destruction of natural spawning grounds, the existence of predatory fish for example Pike and Sheatfish in fries unloading site, and lack of necessary arrangement relevant to artificial spawning. The rate of recruitment of Bream to fisheries calculated 4.6% in 1991 and 2.7% in 1992. |
format |
article |
topic_facet |
Aquaculture Releasing Abramis brama orientalis Caspian Sea Iran |
author |
Saiad Borani, M. |
author_facet |
Saiad Borani, M. |
author_sort |
Saiad Borani, M. |
title |
The role of restocking bream for improvement of the natural stock |
title_short |
The role of restocking bream for improvement of the natural stock |
title_full |
The role of restocking bream for improvement of the natural stock |
title_fullStr |
The role of restocking bream for improvement of the natural stock |
title_full_unstemmed |
The role of restocking bream for improvement of the natural stock |
title_sort |
role of restocking bream for improvement of the natural stock |
publishDate |
2001 |
url |
http://hdl.handle.net/1834/38711 |
work_keys_str_mv |
AT saiadboranim theroleofrestockingbreamforimprovementofthenaturalstock AT saiadboranim roleofrestockingbreamforimprovementofthenaturalstock |
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1756079795310952448 |