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Impacts of Fish Sanctuaries on the Production and Diversity of Plankton in Heels of Haor Region in Bangladesh

S.A. Azher
Department of Fisheries Management Bangladesh Agricultural University, Mymensingh 2201, Bangladesh

F. Khanom
Department of Fisheries Management Bangladesh Agricultural University, Mymensingh 2201, Bangladesh

S. Dewan
Department of Fisheries Management Bangladesh Agricultural University, Mymensingh 2201, Bangladesh

Abstract/ Executive Summary:

The experiment was carried out to study the impacts of fish sanctuaries on the production and diversity of plankton in beefs of haor region at Mithamain Upazila of Kishoreganj district in Bangladesh during July 2004 to June 2005. A total of 75 (60 phyto and 15 zooplankton) and 74 (59 phyto and 15 zooplankton) genera of plankton were recorded in T-1 and T-2 (with sanctuary) respectively while only 50 (39 phyto and 11 zooplankton) genera were obtained in T-3 (control). Chlorophyceae and Copepoda were the most dominant group of phytoplankton and zooplankton respectively in all the treatments. The total phytoplankton numbers were found to range from 5472 to 35,833 cells/l and 5250 to 40,472 cells/l and total zooplankton from 667 to 1722 cells/l and 611 to 1667 cells/I in T-1 and T-2 respectively in sanctuary sites whereas the ranges of phytoplankton and zooplankton in the control site were 1778 to 29,333 cells/I and 56 to 1056 cells/I respectively. The maximum phytoplankton and zooplankton were recorded during winter season in all the treatments. The ranges of total plankton were 6194 to 37,500 cells/I, 6028 to 41,806 cells/I and 1889 to 29,444 cells/l in T-1, T-2 and T-3 respectively. The phytoplankton, zooplankton and total plankton recorded in treatments with sanctuary were significantly higher (p<0.5) than the treatment without sanctuary (control) indicating positive impacts of sanctuaries on the production of .plankton. Between two treatments of fish sanctuaries the total plankton populations were comparatively higher in T-2 than T-1.

Keywords: Fish sanctuary, Impacts, Beel, Plankton

Location: Mithamain Upazila, Kishoreganj district.

Start Date: 00-07-2004

End Date: 00-06-2005

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

To know the impacts of sanctuaries on the production and diversity of plankton in beel

Methodology:

The experiment was conducted for a period of 12 months from July 2004 to June 2005 in two beels situated at Mithamain Upazila of Kishoreganj district to study the impacts of sanctuaries on the production and diversity of plankton population. For this purpose, the quantitative and qualitative study on plankton in the study area were introduced. The status of physico-chemical parameters of water was also recorded during the study period. Two types of sites had been included in this study. Dopi beel was selected for establishing sanctuaries (for 2 years duration) through Fisheries Community and CBFM (Community Based Fisheries Management) project of DoF (Department of Fisheries) and Chotadigha-boradigha bee! was used as control. i.e. without sanctuary (T-3). The results of the study on control site were used to compare the results of the study of sanctuary sites. Two treatments of separate design of sanctuaries having 3 replications for each were established in Dopi beel The sanctuaries were established during December in 2003. The area of each sanctuary was 15 to 20 decimal. he designs of sanctuaries are given below: • In treatment-I (T-1) sanctuary was established in each replication by using brush park, bamboo and bamboo pole, bamboo pipe, betel nut tree - by making them like pipe, fish friendly structure like' Chali leaf of coconut tree, etc. and water hyacinth, only in winter season. • In treatment-2 (T-2) sanctuary was designed by using brush park with bamboo and bamboo pole, old broken country boat, water hyacinth (only in winter season) and triangular fish friendly bamboo device, locally known as "Hogra ". Recording of air and surface water temperature, transparency, water depth, dissolved oxygen, carbon dioxide, total hardness and pH were done monthly in the morning between 8.00-12.00 AM on the spot by standard method. Plankton samples were collected monthly from three specific locations of each site that is from each replication of every treatment of Dopi beel and Chotadigha-boradigha beel (control). Ten liters of water were taken from each locations of every replication of beel using a tube sampler made of flexible uniform plastic tube (PVC pipe sampler). The plankton population present in 30 liter (10 liter from each location) and made 50 ml for preservation after adding buffered formalin and distilled water in small plastic bottle for subsequent examination in the laboratory. The preserved samples·were studied using a Sedgwick-Rafter cell (S-R cell) and a compound microscope (NOVA 950 ES). One ml stored sample was transferred to the counting cell. Plankton was expressed numerically as cells/L.

Source of Information: Bangladesh J Fish. Res., 10(2), 2006: 139-150

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest crops of phytoplankton were found during January in T-1 and T-2, and in December in T-3. Whereas the lowest abundance of phytoplankton was recorded in October in all the treatments.

Knowledge Management: Journal