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Biodiversity Enrichment in Meduary Beel of Bangladesh

B.K.Chakraborty
Department of Fisheries, Dhaka, Bangladesh

S.A. Azad
Department of Fisheries, Dhaka, Bangladesh

A. Siddiqa
Department of Fisheries, Dhaka, Bangladesh

K.M.M. Hasan
Department of Fisheries, Dhaka, Bangladesh

Abstract/ Executive Summary:

A scenario of total number of 55 aquatic species (47 species of wild fishes, one species of prawn, one species of crab, four species of snail and bivalve and two species of turtle) were identified in the beel during 2010-2011. Out of ten types of fishing methods illegal current jal (gill net), Kapuri jal (sein net) and FAD (Fish aggregating device) were detected as detrimental gear and killing method almost all type of species. In 2010, 74.10±4.02 mt of total production of fish and allied species in the Meduary beel was recorded. But in 2011, initiation of new technology for production of carp fingerlings in the Meduary beel through community based co-management policy and enforcement of Fish Regulation Act-1950, helped to augment productivity of the recorded beel from74.10±4.02 to 113.87±3.52 mt exhibiting 107.80% biomass enhancement. Strict enforcement of fish Act-1950 in the beel resulted in reduce rate of use of current jal, Kapuri jal and FAD. One species bata (Labeo bata) was found to have reappeared in the beel and surrounding floodplains [Beel is defined as Flooded large water bodies on dry-season cropland].

Keywords: Biodiversity, Endangered, Illegal fishing, Beel, (carp) nursery.

Location: Bhaluka Upazilla, Mymensingh.

Start Date: 00-00-2010

End Date: 00-00-2011

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

To know the abundance, species combination and catch statistics of Meduary beel

Methodology:

Location, area and Experimental procedure of the beel: The Meduary beel comprised an average area of 840.5ha with an average depth was recorded to be 1.774 to 1.77 m between the year 2010 and 2011. The beel is surrounded by Meduary and Bhraduba villages under Bhaluka Upazilla in the district of Mymensingh. Detail survey on flora and fauna of the Meduary beel was conducted during 2010 to 2011 with particular emphasis on biological productivity and biotic communities, and status of fishery exploitation. Collection of primary data was made by field observation and different experimentations which comprised of experimental fishing in the beel, Secondary data were collected from Department of Fisheries and from the local fishers. Fishing method : Fishers’ used ber jal (seine net), bua jal (small lift net), cast net, current jal (gill net), dharma Jal, various type of fish traps, fishing by dewatering FAD (Fish aggregating device), hook and line, lift net and thela jal (push net); and according to season and availability of different species of fish. Data collection : he study was given a broad picture of a stock of fishes, prawn, crabs, snail and turtles that was recorded through different markets survey and fish landing centers, directly from fishers’ catch, khata fishing and interaction with fishers’ in the beel. The number of six codes (CR. E, EN, VU, LR and NO) of IUCN was followed to categorize the status of the beel and Shannon index was followed to compare the trend between two years. Formation of committee and Awareness meeting: Local management committee was formed with the community people living in the surrounding area of Meduary Beel consisting of 48 members from stakeholders through participatory discussion along with UFO, Department of Fisheries. Nursery Development: On the basis of status and physical condition three treatments (locations) was designated as, T_1,T₂and T₃ in the different area of the beel. The area and average depth of the each earthen nursery ponds was 0.50 ha and 0.71 m, respectively. The nursery ponds were limed (250 kg.ha^-1) and Cowdung (2500 kg.ha^-1) was added in the water. Five days after manuring both Urea and Triple Supper Phosphate (TSP) were applied to the ponds at the rate of 24.7 kg.ha^-1 each to stimulate the primary productivity of the ponds. Dipterex (0.5 ppm) was applied to the ponds to control predatory zooplankton and harmful insects 24 hrs before stocking the spawn. The ponds were stocked at the rate of 2.5 kg.ha^-1 with 4 days old hatchlings of catla (Catla catla), rui (Labeo rohita) and mrigal (Cirrhinus cirrhosus) having an initial length of 1.0 cm and weight of 0.011 g, respectively. Supplementary feeding: In order to meet the increasing dietary demand, supplementary feed consisting of a mixture of mustard oilcake, rice bran, wheat bran and fish meal in 30:25:25:20 proportions was supplied at the rate of 15-20% of their total biomass twice daily commencing from the first day of stocking. The rate of feeding was 20 kg.million hatchling^-1day^-1 for the first one week, 24 kg for the second 2 weeks, 28 kg for the third 2 weeks, 32 kg for the fourth 2 weeks and 36 kg for the fifth 2 weeks. Proximate composition of the feeds was analyzed according to AOAC method, nitrogen free extract (NFE) by subtraction. Water Quality Parameters and Plankton monitoring in nursery ponds: Physico-chemical parameters and quantitative estimates of plankton in the nursery ponds were monitored every 10 days interval between 9.00 and 10.00 h. The plankton sample was collected fortnightly from the euphotic zone using 0.55 blotting silk plankton net and later analyzed numerically with the help of Sedgewick-Rafter counting cell (SR-cell) under a compound microscope. Calculation of the abundance of plankton was done. Estimation of growth, survival, production and feed utilization: Fifty individuals from in each pond were sampled at 10 days interval to adjust daily ration until they attained the fingerlings stage. Growth in terms of length and weight, average daily gain (ADG), specific growth rate (SGR) and food conversion rate (FCR) was estimated. SGR and FCR calculated. Survival rate of fish as well as fish production (kg ha^-1) were also determined as per conventional method. After 60 days, the fingerlings counted and weighed and fingerlings were allowed to release from the nursery ground to the open water area beel after commencement of early monsoon flood. Analysis of experimental data: The data were analyzed through one way ANOVA using MSTAT followed by Duncan’s Multiple Range Test to find out whether any significant difference existed among treatment means.

Source of Information: Bangladesh J. Environ. Sci., Vol. 23, 63-69, 2012 ISSN 1561-9206

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A total of 55 aquatic species (47 species of wild fishes, one species of prawn, one species of crab, four species of snail and bivalve and two species of turtle) were identified in the beel during 2010-2011. Out of ten types of fishing methods illegal current jal (gill net), Kapuri jal (sein net) and FAD (Fish aggregating device) were detected as detrimental gear and killing method almost all type of species

Knowledge Management: Journal