A beel thicky infested with water hyacinth

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Table 9 Water quality parameters of beeh of h am
Biotic communities The abundance and succession of biotic communities occupying the beels arc influenced mainly by the unique water renewal pattan of the ecosystem. The high fluctuations in water level and the alternating seasonal riverine copections arc the inherent characters of the beel ecosystem. Thus, the organisms inhabiting this system comprise a complex mix of lotic and lmtic communities. The dynamic ecological character brought in by the cyclic changes in the Ile morphometry, wata chemisby and sediment characteristics leads to some unique faunal and floral associations. Biot~c communities of beels, thus adapt themselves to spatial and temporal fluctuation leading to a high degree of floral and faunal diversity. The major biotic communities in beels that have a bearing on fish productivity are plankton, benthos, macrophytes and fishes. Plankton comprises microscopic organisms (both plants and animals) with very l~mited or no power of locomotion. They move about and drift in water purely at the mercy of water movements. Phytoplankton bearing photosynthetic pigments make use or the r~ch inorganic nutrients available in the beel ecosystem and synthesize organic matter (autotrophs). Thus, they form the base of ecological pyramid. Zooplankton, on the other hand live on the huge reserve of organic matter of plants or animal origin, both in live and dead form (detritus). Thus, zoolplankton is the secondary producer linking the phytoplankton with the communities occupying higher trophic levels. Zooplankton in beels play a vital role in making efficient use of dead and living organic matter. Both zoo and phytoplankton form direct food and thenby sustain a substantial portion of planktiphagus fishery of beel resources. Most of the beels studied wm found to be infested with weed at varying levels, some of them being wmplaely choked. Floating weeds have deleterious impact on the abundance of the plankton. As a result, avaage numerical abundance of the phytoplankton is found to be low except in Bagheavari beel in Mandira complex of Kamny, dismct. Out of three zones viz. upper, central and lower Assam in Brahmeputra valley, beels in the later two mms exhibited better abundance of plankton as compared
Page 1: ECOLOGY AND FISHERIES OF BEELS IN A
Page 4 and 5: Ecology and fisheries of beels in A
Page 6 and 7: Project participants V-V, Sugunan 8
Page 9 and 10: INTRODUCTION lndia has extensive fl
Page 12 and 13: Importance of beels If managed alon
Page 14 and 15: 6) The standing water (Ientic compo
Page 16 and 17: I) Ox-bow lakes : These are cut of
Page 18 and 19: operatton of fishing gear difficult
Page 20 and 21: Tabk 4. DhMbuUon of bcclr la tbe ri
Page 22: Table S ronfd. ... . .... /an& M~tr
Page 25 and 26: floodplains an flooded. Lakelike be
Page 27 and 28: heavily infested with aquatic veget
Page 29: Table 6. contd. . . ... pH &g.C Av.
Page 33 and 34: Watcr Quality In floodplain wetland
Page 35 and 36: Temp. Trmrp. PH DO CQ, TA Hudnear S
Page 37 and 38: TDS ahride SiO, CI Mg Fc PO, NO, Dl
Page 39: Table 8. contd. TDS Chloride SiO, C
Page 43: Dbhlct Tabk 10 Planktom In differen
Page 46 and 47: l rabh 10, conki eorc.rr.os T ~ W D
Page 48 and 49: Tnhle 10 cod Morlgaoa Mon Kamrup Dm
Page 50: oligochactea and insccto. Thc bee18
Page 53 and 54: However, Samrajan north in the dist
Page 55 and 56: A beel thicky infested with water h
Page 57 and 58: Fish yield potential Fish yield pot
Page 59 and 60: FISH AND FISHERIES Fish fauna Many
Page 61 and 62: Barpeta Area Deptb Dominant fbb (ha
Page 63 and 64: view of recmitmcnUautostocking in t
Page 65 and 66: I1 Fishing operations in beel
Page 67 and 68: 1. Liming in split dosea It regular
Page 69 and 70: whole operation is baaed on captive
Page 71 and 72: Community metabolism Community meta
Page 73 and 74: Fig. 5. Path- of enorgy flow Jn (Or
Page 75 and 76: stocLtagmtc~egmwthrmteof~speckrsttt
Page 77 and 78: Proper stocking and harvesting sckd
Page 79 and 80: Ferrlisarion / Borrom raking Since
Page 81 and 82: Flg. 8. Dlrgnmmatlc npnwnbSion of c

A beel thicky infested with water hyacinth

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