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Impacts of Fish Sanctuaries on Macrobenthic Organisms in a Haor River, the Mohisherkandi Boranpur, Kishoregonj

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

F. Khanom
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
Deportmeni of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An investigation was performed to assess the impacts of fish sanctuaries on production and biodiversity of macro- benthic fauna in a haor river, the Mohisherkandi Boranpur for two consecutive years from January, 2004 to December 2005. Nine sanctuaries under three treatments along with controls (Treatment 4) were studied with respect to sanctuary materials. No significant difference was observed among the treatments in water quality parameters except water depth in both the years and dissolved oxygen in the second year (p<0.05). Total nitrogen and organic carbon present in the bottom soil of Treatments 1 and 2 were Significantly (p<0.05) higher than that of Treatment 4. Available phosphorus in bottom soil of Treatment 1 was significantly (pTubifex sp. Branchiura sotoertrfi, Chironomus sp., Ceratopogon sp., Viviparus and Carbicula sp. etc. were the major macrobenthic organisms in different treatments. Mean total abundance of macrobenthic fauna (number/ m²) were higher in 2004 than in 2005 in all the treatments.

Keywords: Fish sanctuary, Macrobenthic organisms, Haor river, Biodiversity

Location: Methamoin, Kishorgonj

Start Date: 01-01-2004

End Date: 31-12-2005

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

To know the impacts of fish sanctuaries set in haor areas on production and biodiversity of macro benthos for better planning and biological management of sanctuaries and open water bodies of Bangladesh.

Methodology:

The experiment was conducted during January, 2004 to December 2005 in a river situated inside Joanshahi haor under Methamoin upazilla of Kishorgonj district. To compare the effect of the treatments, a control area was selected from another river - the Ghorbhanga (part 1). Methamoin upazila lies between 90°69' and 91°15' North and 24°21' and 24°30' East and is situated within the 19, 20 and 21 agro ecological zone of Bangladesh. Monitoring of temperature (air and surface water), transparency, water depth, dissolved oxygen, carbon dioxide, total hardness and pH were done monthly and soil nitrogen, organic carbon, available phosphorus, exchangeable potassium and soil pH were done once in every three months. Study sites The river Mohisherkandi Boranpur was selected for the study where nine sanctuaries were established under the project CBFM- 2 managed by the local fisher community. The river is a flowing one and is a branch of the Ghorauthra river which is linked to the river systems towards upstream of greater Sylhet and in the down stream connected to the mighty Meghna river. The Mohisherkandi Boranpur retains water throughout the year with the maximum flow and intense wave action in full monsoon. The river comprises an area of 126.62 ha. The Ghorbhanga river (part 1) was treated as control. No sanctuary was established in the Ghorbhanga. The river is fully comparable with the Mohisherkandi Boranpur regarding seasonal water flow and waving and comprises an area of 60.84 ha. A Completely Randomize Design (CRD) with three treatments having three replications under each treatment with a control - Treatment 4 was applied. The sanctuaries were established during November to January, 2003. The average area of each sanctuary was 13.16 ha. Different fish friendly sanctuary materials were used for different treatments. Analysis of variance was performed with the help of computer package SPSS 11.5. The mean values of Treatment- 1, 2 and 3 were compared with the mean values of Treatment- 4 (Control) by DMRT test at 5% level of significance.

Source of Information: BANGLADESH JOURNAL OF FISHERIES, Vol. 30, February 2007, pp. 11-21, ISSN 0257 - 4330.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of this study revealed that no significant difference was observed among the treatments in water quality parameters except water depth in both the years and dissolved oxygen in the second year (p<0.05). Total nitrogen and organic carbon present in the bottom soil of Treatments 1 and 2 were Significantly (p<0.05) higher than that of Treatment 4. Available phosphorus in bottom soil of Treatment 1 was significantly (pTubifex sp. Branchiura sotoertrfi, Chironomus sp., Ceratopogon sp., Viviparus and Carbicula sp. etc. were the major macrobenthic organisms in different treatments. Mean total abundance of macrobenthic fauna (number/ m²) were higher in 2004 than in 2005 in all the treatments.

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