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Impacts of Fish Sanctuaries on Production and Biodiversity of Fish and Prawn in Dopi Beel, Joanshahi Haor, Kishoregonj

S. A. Azher
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

S. Dewan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M. A. Wahab
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M. A. B. Habib
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202

M. G. Mustafa
WoridFish Center, Bangladesh and South Asia Office, Dhaka-1213

Abstract/ Executive Summary:

The impacts of sanctuary on fish production and fish biodiversity were investigated in Dopi beel in Joanshahi haor over a period of two years from January 2004 to December 2005. Broadly two different types of materials were used to set two sanctuaries in Dopi beel referred to as Treatment 1 and Treatment 2; the control treatment was set in another beel named Chotadigha- boradigha beel without using any materials. Data on fish production and species abundance obtained from different treatments were compared. Ten major groups of fish viz carp, barb and minnow, catfish, feather back, snakehead, perch, eel, leach, miscellaneous fishes and prawn were obtained in the final harvest from different treatments. The fish species number was registered at 57, 60 and 62 in 2003 (before intervention), 2004 and 2005, respectively in Dopi beel, while that in Chotadigha-boradigha beel during the same period was 60, 55 and 50, respectively. The total production obtained from the Dopi beel was much higher than that from the Chotadigha-boradigha beeI. The fish species deemed as threatened were found to reappear in Dopi beel, while in Chotadigha- boradigha beel the number of threatened species had been decreased over the 3- year period. The highest density index (H= 0.89) and species richness (E= 0.62) of threatened species were recorded in Treatment 1. Generally the yield of large species had been increased in Dopi beel during the investigation period. The establishment and management of sanctuaries in the beel had beneficial effects on the production of fish.

Keywords: Fish sanctuary, Production, Biodiversity, Fish, Prawn

Location: Methamoin, Kishorgonj

Start Date: 01-01-2004

End Date: 31-12-2005

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

To develop an appropriate design for freshwater fish sanctuary using local fish friendly materials. It is hoped that the study would help in future planning for biological management of open water beel fisheries in haor area.

Methodology:

The experiment was conducted over 24 months during January 2004 to December 2005 in Dopi beel inside Joanshahi haor under upazilla Methamoin of Kishorgonj district. Methamoin upazila lies between 90°69' and 91015' north and 24°21' and 24°30' east. Data of fish catch recorded by World Fish Center during 2003 was used as baseline data to compare the findings of the present study. To compare the effect of treatments, parameters from another beel - the Chotadigha- boradigha beel were also studied. Dopi beel was selected for the study where six sanctuaries were established under the project CBFM- 2 managed by the local fishers community. The beel is fully inundated along with other neighbouring beels and water bodies during monsoon. In dry season, it becomes closed with a narrow link to the river - Mohisherkandi- boranpur through a cannel. The deeper portion of the bee! retains water throughout the year. The area of Dopi beel is 21.74. ha. The Chotadigha- boradigha beel was treated as control. No sanctuary was established in this beel. The bee! is fully comparable with the Dopi beel regarding seasonal water flow, fluctuation of water level and waving with an area of 43.97 ha. In the present study, two sanctuaries (Treatments 1 and 2) having three replications each in Dopi beel along with a control treatment (Chotadigha- boradigha beel, Treatment 3) were applied. Details of treatments are presented. The sanctuaries were established during November to January, 2003. The average area of each sanctuary was about 0.12 ha. Two different sets of fish friendly sanctuary materials were used for Treatments 1 and 2. Catch assessment of fish and prawn in different types of habitats were performed following the methodologies of World Fish Center. Catch assessment monitoring questionnaire developed for CBFM- 1 and 2 was used in this study. Data obtained from baseline surveys conducted by World Fish Center during 2003 was used as base line data. Catch monitoring data and gear survey were conducted weekly from fishermen of both the beels during fishing. Catch assessment survey involved observation of fishing activity for 8 days in each month for each beel. Total daily catches by gear type were estimated from their average catch rates. Name, number and weight of fish species and CPUE were recorded monthly and based on the monthly data, annual yield was calculated. One way ANOVA was performed to determine the significant variations in fish catch/ yield from different beels and treatments. The analyses were done following Duncan's Multiple Range Test. All the statistical analyses were done using SPSS package programme (11.5 versions).

Source of Information: BANGLADESH JOURNAL OF FISHERIES, Vol. 30, February 2007, pp. 23-36, ISSN 0257 - 4330.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The findings of the present study revealed that fish sanctuary enhanced the production of many groups of fishes and prawns. Some rare species reappeared in the Dopi beel including some endangered ones while production and biodiversity of fish fauna decreased in control beef where no sanctuary was established. As the present findings are based on 2- year study only in two beefs, a long-term study covering wider areas of different flood plains is required to assess the proper impacts of sanctuaries and brush parks for the development of a sustainable management policy for different water bodies of Bangladesh.

Knowledge Management: Journal