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

CZFRI ANNUAL REPORT 2007- 2008
Oreochmmis niloricus niloricus, Pterygoplichthys
disjuncrivus and Piaractus brachypomus were
recorded. In Mahane wetland in Uttar Pradesh IMC
and exotic fishes totalling 23 fish species were
recorded.
Microcosm expenment with the macrophyte
Eichhornia crassipes in Assam bee1 indicated its
negative influence on water temperature, water pH,
d~ssolved oxygen and specific conductivity and
positive impact on free CO, and total alkalinity as
compared to other types of macrophytes. Sediment
enzyme profiles showed decreased phosphorus
solubilization by alkaline phosphatase activity
whereas acid phosphatase activity increased due to
floating macrophytes anddccreased due to submerged
one.
The Periphyiic algae of Puthimari heel showed
b~o-accumulation of large amount of Mn and may
possibly be used asa bio-indicatorspccics.
Fish Health & En~*ironmmt
The open water inland fishery in the changing
sccnario of environmental degradation is getting
sipnificantly impacted. This issue becomes very
important for the Institute and accordingly
investigations werecarriedout in river Damoder.
DDTs were estimated in all the water samples
analyzed from nver Damouer, which even exceeded
thepermiss~ble IimitsofEPAforaquatic life.
IBI study in a highly industrialised stretch ofriver
Damoder recorded 55 fish species belonging lo 22
families. Significantly for the first time 5 exotic
species viz. Cyprinus corpio. Ctenopharyngodon
idella, A, nobilis, 77lapia mossambica and T nilorica
havebeenrecordedin thecatches.
Nineteen bacter~a were isolated from river
Damoderfortheirphenoldegradingcapability.
Detectable gene expression ofonly one isoform of
metallothionern gene was observed in Labeo rohira
exposed to 3 different concentrations 1 mgl". 5 mgl.1
and 10mgPi ofcadmium.
Fishery Resource Assessment
The reliable estimation of inland water resources
is very essential to plan fishery development and
conservation. The Institute has been involved in using
remote sensing tool in this estimation across the
countty. Some states have been covered while inothers
the work is going on. Accordingly, in this year, using
TNT Microimage software topographical shcets of
study area were geo-referenced and watershed area of
Murugama (Sahara Jore) water body of Jhalda Block
in Purulia distr~ct was dclincated and computed water
shed area. The data collected at different centers from
various water bodies have been compiled and stored in
thedatabase for fuiurc use.
Data were collected from 50 heclr of Nayaon
district of Assam for development of GIS on wetlands
ofAssam. Only 1 I hce1.s out of49 beck liavemore than
50% macrophyte coverage, whereas 23 heels have less
than 25% macrophyte. Also, most of the heels (39 out
of 49) retained saasonal connection with the parent
river to maintain their natural ecology
Other projrets
Apan from the institutional projects, the work was
also executed for seven sponsored projects viz.,
Strengthening of database and information
networking for fisheries sector, The ecology and