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Biodiversity in Floodplains with Special Reference to Artificial Stocking

M.S. Hossain
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

S. Rahman
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

A. Razzaque
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

M.A. Mazid
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

M.A. Ehshan
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

Abstract/ Executive Summary:

A five years investigation on fish biodiversity in connection with artificial stocking was conducted in three south-western floodplains of Bangladesh from 1992 to 1996. The ten top most available and ten most rarest fish species were identified. Puntius sp., Channa punctatus, Mystus sp., Anabus testudinius, Ambasis sp., Colisha sp. and Macrobrachium sp. etc. were the most common available species. On the other hand, Mystus aor, Notopterus chitala, Clupisoma garua, Aplocheilus panchax, Ctenophmyngodon idella etc. were the most rarest species. However, the most abundant and the rarest fish species behaved differently in different floodplains in different years. Shannon diversity index was used to assess the extent of diversity in different years. The study revealed that the artificial stocking programme, to some extent, influenced the biodiversity in floodplains.

Keywords: Fish biodiversity, Floodplain, Shannon weaver index, Artificial stocking

Location: Major floodplains of Bangladesh

Start Date: 00-06-1992

End Date: 00-12-1996

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

To know the status of fisheries diversity and its dynamics in three floodplains of Bangladesh during 1992 to 1996 in relation to artificial stocking.

Methodology:

The study was conducted from June '92 to December '96 in three major floodplains of Bangladesh. These are the Chanda beel of Faridpur-Gopalgonj depression, the Haiti beel of Pabna-Natore depression and the BSKB (Basukhali-Salimpur-Kola-Barnal) beel of Khulna-Narial depression. Each floodplain possesses distinctive features. The BSKB is completely closed system floodplain and regulated by several sluice gates. The Halti is semi-open while the Chanda beel is an open system floodplain. The area of Chanda, Haiti and BSKB are 10,870 ha; 16,770 ha, respectively. All these beels are prone to monsoon flooding and remain flooded for periods between four and seven months depending on the severity of flood in different years. During the dry season, however, the water area of the beels shrinks to a negligible amount and most of the dried-up land is cultivated with various crops. To accomplish the investigation a weekly data collection schedule was maintained. Data was collected from the fishing spots and peripheral fish landing centres, which are usually called para or gala. Catch composition by number for individual gear was recorded through the examination of catch for the respective gear. In order to data collection most of the gears i.e., more than 23 types of gears, both selective and non-selective were covered in which only 11 were of selective type. A total of 5,55,769 specimens were sampled in the present study of which 2,18,052; 1,71,985 and 1,65,732 samples belonged to Chanda, Halti and BSKB respectively. The Shannon weaver index (H1) was used to measure the extent of diversity by combining aspects of species richness and evenness. It is perhaps the most commonly used diversity index in ecology.

Source of Information: Bangladesh J. Fish. Res., 4(1): 69-74, 2000

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The ten top most available and ten most rarest fish species were identified. Puntius sp., Channa punctatus, Mystus sp., Anabus testudinius, Ambasis sp., Colisha sp. and Macrobrachium sp. etc. were the most common available species. On the other hand, Mystus aor, Notopterus chitala, Clupisoma garua, Aplocheilus panchax, Ctenophmyngodon idella etc. were the most rarest species. However, the most abundant and the rarest fish species behaved differently in different floodplains in different years. Shannon diversity index was used to assess the extent of diversity in different years. The study revealed that the artificial stocking programme, to some extent, influenced the biodiversity in floodplains.

Knowledge Management: Journal