Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India
The Dhir Beel, one of the major live beels of the Brahmaputra Basin, Assam, has an area of 689 ha and situated in Dhubri district of Assam. The dominance of freshwater shark, Wallago attu (8.10%) in the beel is a striking feature. Restricted breeding of W. attu once a year from June to September was...
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ftoceandocs:oai:aquadocs.org:1834/31821 2023-05-15T15:33:20+02:00 Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India Goswami, P.K. Devaraj, M. 1992 application/pdf 13-20 http://hdl.handle.net/1834/31821 en eng http://hdl.handle.net/1834/31821 http://aquaticcommons.org/id/eprint/16012 12051 2015-01-24 15:02:00 16012 Indian Fisheries Association Biology length-weight relationships river basins freshwater fish Wallago attu Dhir lake Brahmaputra River Assam India article 1992 ftoceandocs 2023-04-06T17:04:30Z The Dhir Beel, one of the major live beels of the Brahmaputra Basin, Assam, has an area of 689 ha and situated in Dhubri district of Assam. The dominance of freshwater shark, Wallago attu (8.10%) in the beel is a striking feature. Restricted breeding of W. attu once a year from June to September was observed. The mean observed length was 37.5, 65.0, 84.5 and 99.0 cm in the 6th, 12th, 18th and 24th months of age respectively. The length growth coefficient (K), the asymptotic length (L infinity ), and the arbitrary origin of the growth curve (t omicron ), for W. attu were estimated to be 0.054484 per month, 136.16 cm and 0.0355 month respectively. The calculated life span (T infinity ) of the fish is 123.86 months (about 10 years). The weight growth parameters were estimated where the monthly growth coefficient (K), the asymptotic weight (W infinity) and the arbitrary origin of the growth curve (t omicron) were found to be 0.0743 per month, 7636.92 gram and 0.431908 month respectively. The length-weight relationship follows the cube law. Article in Journal/Newspaper Attu IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Biology length-weight relationships river basins freshwater fish Wallago attu Dhir lake Brahmaputra River Assam India |
spellingShingle |
Biology length-weight relationships river basins freshwater fish Wallago attu Dhir lake Brahmaputra River Assam India Goswami, P.K. Devaraj, M. Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
topic_facet |
Biology length-weight relationships river basins freshwater fish Wallago attu Dhir lake Brahmaputra River Assam India |
description |
The Dhir Beel, one of the major live beels of the Brahmaputra Basin, Assam, has an area of 689 ha and situated in Dhubri district of Assam. The dominance of freshwater shark, Wallago attu (8.10%) in the beel is a striking feature. Restricted breeding of W. attu once a year from June to September was observed. The mean observed length was 37.5, 65.0, 84.5 and 99.0 cm in the 6th, 12th, 18th and 24th months of age respectively. The length growth coefficient (K), the asymptotic length (L infinity ), and the arbitrary origin of the growth curve (t omicron ), for W. attu were estimated to be 0.054484 per month, 136.16 cm and 0.0355 month respectively. The calculated life span (T infinity ) of the fish is 123.86 months (about 10 years). The weight growth parameters were estimated where the monthly growth coefficient (K), the asymptotic weight (W infinity) and the arbitrary origin of the growth curve (t omicron) were found to be 0.0743 per month, 7636.92 gram and 0.431908 month respectively. The length-weight relationship follows the cube law. |
format |
Article in Journal/Newspaper |
author |
Goswami, P.K. Devaraj, M. |
author_facet |
Goswami, P.K. Devaraj, M. |
author_sort |
Goswami, P.K. |
title |
Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
title_short |
Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
title_full |
Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
title_fullStr |
Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
title_full_unstemmed |
Breeding, age and growth of the freshwater shark Wallago attu (Bloch and Schneider) from the Dhir Beel of the Brahmaputra Basin, Assam, India |
title_sort |
breeding, age and growth of the freshwater shark wallago attu (bloch and schneider) from the dhir beel of the brahmaputra basin, assam, india |
publishDate |
1992 |
url |
http://hdl.handle.net/1834/31821 |
genre |
Attu |
genre_facet |
Attu |
op_source |
http://aquaticcommons.org/id/eprint/16012 12051 2015-01-24 15:02:00 16012 Indian Fisheries Association |
op_relation |
http://hdl.handle.net/1834/31821 |
_version_ |
1766363810759704576 |