2016 Vol.22 No.2 PP 237-251

OBSERVATIONS ON PHYTOPLANKTON, PRIMARY PRODUCTION AND FISH YIELD OF AN OX-BOW LAKE DAH-REOTI, BALLIA (U.P.) INDIA

^*A.K. JHA, S.P. SINGH¹ AND S.R. SINGH

Department of Zoology,
S.M.M.Town Post Graduate College,
BALLIA (U.P.) INDIA
¹G.S.Rai Girls Degree College,
KARNAI, BALLIA (U.P. INDIA
*Corresponding Author
E-mail: ashu_jha29@yahoo.co.in

ABSTRACT

Observations have been made over a period of two years on the phytoplankton primary production of an Oxbow lake in relation to abundance and composition of phytoplankton community and physico-chemical variables of water. The relative photosynthetic activities of different algal groups could not be observed due to dominance of blue green algal form Microcystis aeruginosa. throughout the year. Maximum production rates coincided with the super abundance presence of blue green forms. High temperature, nutrient loading, high ionic concentration were observed closely associated with higher rates of production. The fish harvest from the lake in relation to primary production suggests a conversion rate of only 0.09% The causative factors for low fish yeild have been discussed and measures to boost up the fishery, suggested.

Key words : Ballia, Fish yield, Phytoplankton, Primary production.