THE MONITORING OF PHYTOPLANKTON EVOLUTION BY BIOLOGICAL YEAR WITHIN ARINIS-MARAMURES FISHERY COMPLEX
T.E. Oroian, R.G. Oroian, Cristina Hegedus, V. Cighi, D. Dronca
The research took place on the period 2005-2008, being a part of CEEX project, number 45/2005, module I Biotech. The purpose of the study was the monitoring of phytoplankton evolution in the nine fish ponds, having in total a surface of 90 hectares, being an indicator of the water biologic qualitative level. The phytoplankton having algae in its composition, a base for the consumers development, we observed the composition of Chlorophyceae, Cyanophyceae and Diatoms species. We established the taxonomic composition for each month of the study, evaluating the species number, as well as the percent from total value. Specially, we examined Cyanophyceae, Crysophyceae, Bacillariophyceae, Chlorophyceae, Conjugatophyceae, Euglenophyceae, Cryptophyceae species. Within the Chlorophyceae we identified: volvocals, protococaceae, Desmids; within the Cyanophyceae, the genera: Spirulina, Coelosphaerium, Oscillatoria sp., Dactylococcopsis, Merismopedia, Microcystis. The identified Diatoms, especially in springtime, are included in the genera: Melosira, Cyclotella, Amphora, Navicula sp., Achnanthes, Asterionella, Cymbella, Cocconeis, Fragillaria, Synedra. The phytoplankton taxonomic composition shows a good qualitative water, proper for carp culture.
Key words: phytoplankton, taxonomic composition, Chlorophyceae, Cyanophyceae, Diatoms