Studies Concerning the Dynamics of Physical, Chemical and Biological Indicators of a Fishing Pond and Enclosed in Quality Class

Abstract

Research has been to reveal the changes that take place in water chemistry related to the life of phytoplankton in a growing fishpond of carp species during 2011. Lower values ​​of temperature, in the spring 11.65±0.89⁰C, less amount of organic matter 5.17±0.13 mgO₂/l, dissolved oxygen 7.13±0.2 mg/l , oxygen saturation level of 72%  indicates high percentages of diatoms 56,86% and Cyanophyceae 35.53% and lower by Chlorophyceae 13.73%. Ratio changes in summer where have it significant proportion the Chlorophyceae species: 44.71%, decreases that of the diatoms 20% and appear Euglenophyceaele (8.21%). Euglena viridis, Trachelomonas sp., that denote the beginning of accumulation of organic matter not degraded, fact resulted from the ratio of CCOMn/ dissolved oxygen lower (51%) than that received in the previous season 72%. The values ​​of physical - chemical study compared by two methods for the classification of water after Order 161/2006 and Index Water Quality, enclose water quality in both cases in mesoprobic zone and after level of water pollution as phytoplankton composition obtained by Shannon diversity index: (-1.138) in the spring (-1.685), in the summer and (-1.541) in the fall indicates a moderately polluted of water. General characterization of the water according to the method proposed by Nancy Gordon (2004) includes water quality: β mesoprobic of the Spring season after organic matter content 5.17±0.13 mgO2/l and oligo-mesoprobic tending to β after dissolved oxygen:7.13±0.2 mg/l and  β to α  mesosaprobic both summer and autumn seasons in terms with amount of organic matter and dissolved oxygen content of water.