In this study, we investigated the physical, chemical and biological parameters of the water column at two stations under di¡erent trophic conditions during a 1year period (from September 2005 to September 2006 in an aquaculture area. The investigation was performed monthly at a station inside the ¢sh farm in Maslinova Bay (middle Adriatic Sea, Croatia) and at a control station located in the Hvar Channel in the vicinity of the farm.The results showed that the concentrations of dissolved nutrients were slightly enhanced at the farm station in comparison with the control station, although those di¡erences were not statistically signi¢cant, nor were the di¡erences in oxygen saturation recorded during the investigation period. As opposed to the chemical parameters, considerably higher deviations were recorded for biological parameters as demonstrated by a signi¢cant increase in phytoplankton biomass and primary production (measured in situ) at the farm station, particularly during the summer season. Phytoplankton community structure analysis showed that the phytoplankton composition at the farm was mostly determined by seasonal changes rather than by the in£uence of ¢sh farming. In Maslinova Bay, no causal links were identi¢ed between increased biomass and the appearance of toxic species.
Growth is one of the main manifestations of life. It is assumed generally that bacterial growth is constrained mostly by nutrient availability (bottom-up control) and grazing (top-down control).
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