cifri annual report 2007- 2008 - Central Institute of Brackishwater ...

percentage of' Gcophytcs after Errant vascular platits,
(iv) that only a few species tend to ovcrtakc the niches.
Icaditig to declinc in the diversity of trur hydrophytcs.
The fish firuna, plankton and niacro-bcritic divcr5ity
found positively corrclatcd with thc abuntlancc of'
macrophytes. Appirrctitly, the Heels of Assan) and
Wcst Bengal necd rcliabilitation it1 tcr~ns of' tht.
mnn:tgctncnt of macrophytcs, cspccinlly thc weeds li~r
fishcries cnhaticcment.
Thc Ecology and Managcmcnt of Aquatic
Weeds in Gangs and Brahmaputra basin with
particular refcrcnce to Fisheries ~nhancement
(ICAR Ccss Fund).lJnder the prqjcct a total of'(,[) (30
Assanl arid 30 Wcst Bcvgal) flocxiplain wetlands have
cxtcnsivcly bccn survcycd it1 rclation to niacropliytc
diversity, abundance and their itnpact on other
biodiversity, such as plirnkton and benthos. A total of'
5 1 spccics in Assnrn and 43 spccies of macrophytes
could bc collected, idcntilicd and photogr~licd. The
trend of tnacroptiytc proliferation (phyto-sociology)
in floodplain wetlands of' Assam and West Hcngal
showcd thc grcatcr dominance of crrant vascular
plants followed by theorophytes, indicating (i) that the
lakcs arc losing their acluatic chitracteristics by
becoming shallow and heading towards a marshy
condition, and ultimately to tcrrcstrial habitat, (ii) that
thc greater dominance of' errant vascular plants
followcd by geophytes in West Rcngal and
therophytes in Assam also indicate high lcvel of
eutrophication, (iiilthat the aquatic regime in
Wetlands of Wcst Hcngal is relatively better as
comparcd to Asom as evidenced from the higher
Popularisation of Organic Farming :ipproach
in Pishcrics for Sustainable Dcvcloprncnt (IC'AR
Ccss Fund). Thc project work is bcing carricd out :~t
Karnarhati and Surynpur undcr thc District of'Nortli 2.3
1'arg:uias and .I:~yrarnb;r~i ur~dcr Hankurir I)istrlcl in
collaborntion with Iiamakrishna Vivck:~n;lticla
Mission. Main thrust has bcctl givcn oti utilrz;~tion of'
orglnic inpiits nir~iicly Raw C'OLY I)~rtig, C'OIIIPOS~,
I'oultry littcr, Duck dropping anti VC~-tiiicolnpos~ to
grow fishes in the walcr hodies. Mnxi~nurn protlt~ction
L
of 2800 kg/lia/6 months was ohtaiticd lio~ii a ponil
whcre duck dropping was uscd.
Databiisc on Taxonon~y and distribution of
Freshwater fislles of' India (IC'AR ~'css Funcl) it1
linkage with N13FG12, L,ucknow. IJndtr tli~s project,
indigenous fish spccics occurring it1 Magtrri hcel (;I
;,ercnnially opeti bccl located near Ci~riji~ti fish Iirtlding
centre of River Dibru) in Tinsukia district iuici Ilipor
beel (a soasonally opcn bccl located net!; Ciuwahnti )
was documcntcd. Maguri beel recorded n fi.w rivcrinc
forms (c.g., Cllcla c~rt*ll iirs, Botitr c1[rtaio, f"rtltirr.v
g~1iu.v) in additic~n to I tirto. M\:~tlr.r. \yi//trllr.s :in(/
Cira~~rru p~otctntzr.v. 111 Dipor becl (which has rccctitly
bccn dcclared as a Katnsar site) orily 12 small
economic fish species (Colisa ,fir,ccirrtlu. Nontlu.~
iiuttdw, ./ltrahas tcr.~rdii~c~trs, Mjl.rtri~ littrrtlr.~, /I.