COMPARISON OF PHYSICO-CHEMICAL FEATURES, PHYTOPLANKTON AND ZOOPLANKTON AND FISH PRODUCTION BETWEEN PERIPHYTON BASED AND CONTROL MONOCULTURE SYSTEM
An experiment on comparison of physic-chemical features, phytoplankton and zooplankton and fish production between periphyton based and control monoculture system of cirrhinus reba was conducted for a period of 120 days in six earthen ponds. In Treatment1 bamboo poles were used as artificial substrate for periphyton growth and in Treatment2 (control) there was no artificial substrate. Each of the 6 ponds was limed and fertilized then 60 fingerlings were stocked (average size: 10.73 cm and weight: 18g). The physico-chemical features of two treatments water bodies showed no significant differences. A total 37 genera of phytoplankton comprised of four different groups, 13 genera of zooplankton and constitute of two different groups as well as 32 genera belonged to four different groups (Bacillariophyceae, Chlorophyceae, cyanophyceae and Euglenophyceae) formed as periphyton on bamboo poles substrate were recorded. The phytoplankton abundance showed highly significant differences (P < 0.01) between T1 and T2 as well the zooplankton differed (P < 0.05) significantly of those treatments. The production of fish goes to nearer of significant (P < 0.10) different between T1 and T2. The study reveal that Production of fish always higher in T1 then T2. So, it can be state that periphyton grown on bamboo pole and increase phytoplankton and zooplankton in T1. In the point of view, in aquaculture system of T1 (periphyton based), fish can consume more phytoplankton, zooplankton as well as periphyton from their favourable aquatic environments; thus they were bodily gain and increase production in T1. However, it is revealed from the experiment that periphyton based aquaculture provide increased production of phytoplankton, zooplankton as well as fish and low cost technology which can help improved and sustainable aquaculture of Bangladesh. Further long term study needed to explore more knowledge and improved technology of periphyton based aquaculture system.