A beel thicky infested with water hyacinth

More documents

Recommendations

Info

Importance of beels If managed along sc~ent~fic lrnes. fish product~on rn heels can he Increased s~jin~licantl) 13es1des. man) of the closed beels (which are cut-off froni the rller cc~ursc) arc III a translent phase of thc~r evolution Into marshlands. Such water bodies. aparl Srorn iittract~ng n~~yratory and resident watcrfowls. support a r~ch faunist~c d~vcrsity In rhc ti~rnl of plankton. macrophytes, henth~c organisms. Insects and other macrophytc assoelated buna as well as a rich varlety ofa~r-hreath~ng and small s~/ed fishcs. sor11c of uhich arc thrcatcrlctl ones. Thus, conservat~on of these dynamic and pruJiict~\c hdhllata has hccomc nec:csriary for rn rrru consematton of threatened aquatlc spcctcs~rt~cluil~i~p fishes and uatcrfowls In add~tlon. the beds also regulate thc uater rcglrnc arid rliltrlcrlt c~charigc and act as natural filters liowever, a comh~nat~on of tlic prow"c\ 01' river hctl crolut~on irnd the cfl'ects of. cxtensi\e flood control drrd irri~;i~tor~ works Iiabe rctlucei1 thr fish prcldtrct~on of many heels through silt;111on. 11a011~11 destru~t~ot~. illacrophytc ~nfestat~on and ~solat~orl from the seasonal 1lot)ds rcatrrctlng cntr? of rlvcrlnc fish stocks. .fhc floodplains with lhe~r assoc~atetl IC~IIL, iv,ltcr hotl~es ,ire cssent~ally ;I contlnuurn of the rlkers, ind~scr~ni~nate kill~ng Oi hr-ood ;ind ~tt\i'n~lc ti\llcs of comnitrctal species durmg the hrcedlng and recrultmcnt se;isons II,I~~! I~dnlpcr\ 111~. prolluct~on 111 the lake as \+ell ;IS In t h ri\ers ~ Thus. there I\ a11 II~~CIII IICC~ lo Iorir~~ili~~c sour111 17iariagcnient norms for strstairlahlc de\el~lpnlcirr ar~d O~NIIII.~~ ~t111i/.tt1011 111 ~hc heels Lccprng In \ic\r the conscr\atron of the produc~~> c alld ~!.II.III~IC CCO~~\ICIII H h~lc incrcasii~g their fish productton to opttmal le\cls Floodplains 1'11~. lI(~t)dj)l;iit~s iire c~tllcr pcnnancnt or terilporary uater bodies assoc~atcd H it11 rl\crs ttlirt constantly shill thc~r hds especially in thc po~arnon rcplmes. The frequency uitll \\IIIc~ a rI\.cr changes ~ts course depends on a number of var~ables l~kc flow \elocrty, ~cd~nlc~lt transporratlon rate. slope, channel pattern, water and sedrment y~cld. amour11 and durat~on of prec~p~tation ovcr the catchment area, texture and lithology of so11. IC~IOIIIC SIQ~LIS. and so on.
Accordlng to Leopold er a1 (1964). a typical floodplain will include thc following: 1) The nver channel rr) Or-bows or ox-bow lakes ~hci, rrprc.sc.nr rhc, cur-qffporrrorr ri/ rrrc*irtit/t~r rr1,r.r T11z.v~. urz, ustctrlh. .rt~rpc~ttrrtrc or horse-shr~c. shrlpc~tl hctli/\ t// (1 :rr/ Point hars 7h~t.7~2 urc locr of tle/~osrrrntt on /he corn,t>~ .rrtlc of ccrr?,c*.\ 111 rlrc. e~lrtrr~rrt.l 11, Mca~ider scrolls I)rprt~s.~iorr.t trnd rrses 011 rlcc c-orrrrcp.i srrlc~s I!/ Ac.~rel.r fi~vt?~~.tl II.\ rhc~ c.htrirrrc~/ mrgrirfcs lorcrctll~. tlontl \~rlllc:\, 151, rhc rrosron o/ fhc, c.iiri ~/~e,/lociilplurt~ .sur/trt~c, ctrlltrc~r~r~t ro rlrt, I hirrrttcl. ir.srr~rlI1~ t.ot~/trrrr~tig c.otrrso. mtr/c~rrul.\ cicposc~rcl o/ tire, [,hLrrrrre/ htrriks Tlrc>se trrc rnosrJrcqrcc~rr~l~~/u~~~~~I cr/ //I
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 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 and 40: Table 8. contd. TDS Chloride SiO, C
Page 41 and 42: Biotic communities The abundance an
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
show all

A beel thicky infested with water hyacinth

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?