Ecology of Shakla heel (Brahmanbaria), Bangladesh
The bed Shakla, comprising an average area of 75.0 ha is located in the northeasternregion (Brahmanbaria district) of Bangladesh. The study was carried out to assess theecological aspects of bed ecosystem. Surface run-off and increase inflow of rain waterfrom the upper stretch during monsoon cause inundation and resumption of connectionbetween beel and parent rivers. The range of dissolved oxygen (DO) content ( 4.5-8.9mg/L) was found congenial for aquatic life. pH was in the alkaline range (7.3-8.5) andfree C02 was reletavely high. Lower values of total hardness and total alkalinity indicatedless nutrients in the beel water. A wide variation (1.4-27.2 x 103 ceHs/L) in the standingcrop of total plankton was recorded during study period of which phytoplankton alonecontributed about 90%. Phytoplankton diversity in the beel represented by three groupsviz. Chlorophyceae, Myxophyceae and Bacillariophyceae in order of abundance. A totalof 52 fish species belonging to 36 genera, 20 families and 1 species of prawn wereidentified so far from the beel. About l3 types of fishing method were found inoperation. Seine nets (moshari berja, ghono berjal) and gill net (current jal) wereidentified as detrimental gear killing juveniles of different species during post spawningperiod. Kua fishing was also found harmful due to dewatering nature. A total of 11species belonging to 11 genera and 10 families of aquatic weeds were identified from thebeet The eggs of Macrobrachium Jamarrei were identified into the Najas najas vegetationduring April-September.
| Main Authors: | , , , , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2004
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| Subjects: | Ecology, Beel, |
| Online Access: | http://hdl.handle.net/1834/33213 |
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