HARSHA NAYAK, b.f.sc.2019-07-052019-07-052011http://krishikosh.egranth.ac.in/handle/1/5810112947Aquatic systems are those in which the primary medium is water which is inhabited by many organisms. This broad aspect covers a wide variety of habitat types, although they are divided into two separate groups viz, marine and freshwater systems. Research on aquatic system has generally reflected this division viz.. Limnology - the study of inland waters and Oceanography - the study of marine systems, proceeding more or less independently for many years.Thesis