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

CIFRI ANNUAL REPORT 2007- 2008
Other exotic fish specics commonly encountered arc
Borhon,vmus gonionottrs (Printitrs ,qoriionotris)
P(~ngasiano(fon h.\pophthalmu.s (Yangclsiri.s .rutceki),
C1aric.r~ g~rric>pinnuc., 0rcoc.liromis nilot inis nilot icvc.~,
Ptcg\lgopIirkth~~s di.rjtrnc.tivus and Pinr~c-tu.r
hraclrj~pornus.
Fig. 4: (:etch anti yield of n~iursl fish stock
fronl wethnds of West Rrncal
Fish catch, yield arid CPUE increased with increase in
water lcvel to a certain lcvel arid then showcd
decreasing trend. The yicld of'stockcd tishes (Indian
and Chinese tnqior carps) was 44X to 1637kg ha '.
Rindi~c~r.vitj, stutrrs qf w~tlnnds nf U+,vt R~ngul : A
total of 76 specics among 55 gcnera and 30 li~rnilics
were recorded. 7'hc nunibcr of fish spccics recordcd
fomi Hcladanga. C'handania. Bhornra, Khalsi. K;ija,
Charnorciaha. Hot-thy and Kol wet larid was 5 1,55,30,
3 1.33,25,38, arid 6 1 , rcspcctively.
ol~~~o,~/lt~ol~l/\
/ll/,l/l, 11,s 111/,1/1, /I\
/'rl~l~\~~o/l/l, /l//ll,\ l//\/llll~ lll~ll,\
ICxotic fish species recurded from wcrlands
Fish stock assessment in wctlands
Fish catch and yield as well as environmental
paramctcrs from C'handania. Hcledanga, C'hamordaha,
Borthy and Raja wctlanfls, situated at 24 Prrrganas
North district; Khalsi and Bhomra at Nadia district and
Kol at Hooghly district, were studied. The yield of
natural fish stocks fiom these wetlands varicd from
139 to 609kgha. The catch composition showcd that
Puntius spp. as a group forl~ls a major contributor to the
total catch of these wetlands (6-20%), fi)llowcd by
C'hanna spp. (7- 1 8%) and prawns (5- 12%).
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Mahane wctland located on Cianga river basin in
Unnao district of' Uttar I'radcsh was selected for
investigation. Thc total water sprcad area of thc
wctland was 39.9X ha. Watcr qualiti\ rcflccts that
wetland IS highly pmductivc.
Biotic. c~ornnrunitic~s : Plankton in Mahane wetland
varied from 380 to XXO UI ' (av. 506 UI ').
J'hytoplankton (95.25 "4) productivity was
significantly highcr with prcdorninancc of tliatoms
(48.55 %). Modcratc periphytic density (830 IJcm ")
was rccorded during post monsoon and which
significantly increased in winter month (305 1 IJcm ').
Nurncrical nbundancc of' associated rnicro flora and
f'auna in the wetland varied from 7 I0 to 2 100 Ucm 'on
average valuc basis. lr~fcstation of macrophytcs was
poor. only shorc arcas had luxuriant growth of lj~ornc~~