common among the local inhabitants who are unaware of the state of
pollution in the lake water. Vector borne diseases also increased. Prawn
and fish have been found to be affected by diseases leading to some farms
being abandoned. The lands thus abandoned are useless for agriculture too.
The lake at present is prone to siltation, enchroachment, blockages in
canals. Due to aquaculture, 15 local varieties of fishes are endangered. As
oxygen dissolution in water is decreasing, the number of fishes living in
surface water is increased.
Let us observe the following table showing different activities in
the lake and their influence.
Legend:(+) means has influence on the mentioned problem
(-) means has no influence on the mentioned problem
What are the factors that affected the number of migratory birds to
decrease?
Do you find any relationship between biological and physical
problems? What are they?
What are the reasons for chemical problems?
What happens if the dissolved oxygen reduce in lake water?
Is BOD of turbid and nutrient rich water high or low? What are it’s
consequences?
People living in catchment area of Kolleru faced so many
problems. Why?
How does polution influence the migration of birds?
