Phytoplankton of Slavonian Fishponds

Fitoplankton u ribnjacima je od izuzetnog značaja jer predstavlja osnovnu kariku u hranidbenom lancu. Cilj ovog rada je odrediti strukturu fitoplanktonskih zajednica u 4 šaranska ribnjaka (dva s ribljom mlađi i dva s odraslom konzumnom ribom) u ovisnosti o različitim abiotičkim čimbenicima. Sastav fitoplanktonske zajednice je bio sličan u svim istraživanim ribnjacima, međutim međusobno su se razlikovali u dominantnim vrstama. U ribnjaku Donji Miholjac A18, gdje se nalazila riblja mlađ, najveću biomasu imala je vrsta Aulacoseira pusilla, dok je u drugom ribnjaku s ribljom mlađi (Grudnjak A1) najveću biomasu imala vrsta Plagioselmis lacustris. U ribnjaku Grudnjak C3 su dominatne vrste bile Cryptomonas ovata i Cryptomonas erosa, a u ribnjaku Donji Miholjac C1 Cryptomonas ovata i Plagioselmis lacustris.Phytoplankton in ponds is extremely important because it represents the basic link of the food web. The objective of this study was to determine the structure of phytoplankton in four carp ponds- two ponds with juveniles and two ponds with adult carp depending on different abiotic factors. Phytoplankton diversity was similar in all ponds, but differences were found in predominant species. In one pond with juveniles, Donjii Miholjac A18, the highest biomass was recorded for the diatom Aulacoseira pusilla, while in the other pond with juvenile fish, the pond Grudnjak A1, the highest biomass was the species Plagioselmis lacustris. In the Grudnjak C3 pond, the dominant species were Cryptomonas ovata and Cryptomonas erosa, and in the Donji Miholjac C1 pond, Cryptomonas ovata and Plagioselmis lacustris