Artemia population was investigated monthly between November 2013-July 2014 in Tuz Lake and 5 stations were selected; one from the west side, 4 from the east side of the Lake. Some physical and chemical parameters (depth, secchi depth, water temperature, dissolved oxygen, conductivity and pH were measured monthly and ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, orthophospate, alkalinity, total hardness, chlorophyll a, silicate concentrations were measured seasonally) of the Lake water were also determined. Artemia was found only once at the second sampling on March, in the 5th station in metanauplius form about 3,67x10 3 individual.m, cycts were not found during the research. At the stations, chlorophyll a concentration (0.18-2.70 μg l-1) and orthophosphate concentration (0-1.07 mg l-1) values were found to be quite low, and ammonium nitrogen concentration values varied between 1.25 mg l-1 and 3.25 mg l-1. It is thought that Uluırmak and Peceneközü Brooks and DSİ Drainage Channel flowing into the basin of Tuz Lake affected the ammonium-nitrogen and orthophosphate concentrations in the Lake. The long-term investigations of the biological, physical and chemical properties of Tuz Lake will contribute to revealing the factors that caused to the present condition of the Lake.

Several water (dissolved oxygen, pH, ammonia-nitrogen, nitrite-nitrogen, nitratenitrogen, total phosphorus and orthophosphate) and sediment (organic matter, total nitrogen, organic carbon and phosphorus) quality parameters, as well as benthic macroinvertebrate communities were investigated monthly between May 2007 and November 2007 at a rainbow trout farm located on one of the sources of the Sakarya River in Central Anatolia. Water and sediment samples were collected from three stations, i. e., the inlet of the farm, which was a karst spring-originated pond, the outlet of the farm, and a location 200 m from the outlet of the trout farm, which has a capacity of 30 t annually. These water quality parameters were compared to the acceptable effluent limits proposed for trout farming in different countries. Ammonia-nitrogen, total phosphorus and orthophosphate were found to be higher than the acceptable effluent limits during the study period. Sediment quality parameters were also found to be higher than those at the inlet of the farm. The benthic macroinvertebrate community consisted of only Gastropoda (Limnaedae, Planorbidae, Neritidae and Pleuroceridae). Almost identical organism groups were observed at the three stations, and the highest abundance was found at the outlet of the farm during the study. Finally, as an indicator of damage to the environment, the biodiversity indices were generally measured at levels below 1 in all stations.

Phyto/zooplankton composition, chlorophyll a, and some water quality parameters were investigated in a spring-originated pond in Central Anatolia between February 2001 and January 2002. Water temperature, pH, dissolved oxygen, Secchi depth, total and calcium hardness, nitrate-nitrogen, nitrite-nitrogen, ammonia-nitrogen, total phosphorus, and soluble reactive phosphorus levels were analyzed. A total of 49 species belonging to Bacillariophyceae, Chlorophyceae, Cyanophyceae, Cryptophyceae, and Dinophyceae were identified. The highest phytoplankton abundance was found in August, whereas the lowest was determined in January. Phytoplankton abundance increased from February to August and declined in the following months. The Bacillariophyceae were dominant in the phytoplankton community. A total of 21 species of Rotifera, 2 species of Cladocera, and 1 genus of Copepoda were found. The zooplankton community was dominated by Rotifera. The highest abundance of zooplankton was recorded in July and the lowest value in November. The annual mean concentration of chlorophyll a was measured as 1.90 mg l -1 . In spite of these eutrophic levels (mean values of total phosphorus and nitrate-nitrogen: 0.069 mg P l -1 and 0.68 mg N l -1 ), phytoplankton cannot grow satisfactorily because of the short water retention time (0.6 day -1 ). The shallowness of the pond together with the low phytoplankton biomass and the high concentrations of nutrients are discussed.

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In this study, it was aimed to determine the status of Artemia population in Tuz Lake The study was conducted between October 2014 and September 2015. Artemia and water samples were taken seasonally in autumn and winter, monthly in spring and summer from 3 stations. Artemia population was found in 3 th station in May, June and July. Total abundance was calculated as 3.2±0.2 -42±5 number x10³/m³. Also, the density of Artemia planktonic cysts were 960±110 -271200±97000 number x10³/m³. The highest density of cysts was observed in July when the population was about to disappear and matures were dominant. The largest cysts diameter values were measured in May on hydrated cysts. The water parameters were determined in terms of temperature (6.40±0.10 °C-29.4±1.00 °C), dissolved oxygen (1.26±0.08 mg/L), salinity (226±5.77 g/L-366±20.13 g/L), pH (7.37±0.00 -8.12±0.01), water depth (8±1.00 cm-35±1.5 cm), and transparency (7.66±0.60 cm-35±1.50 cm). In previous studies (conducted in Tuz Lake between 1994 and 2017), it was claimed that climatic change and human effects has been an important factor in fluctuations of Artemia population. In conclusion, data evaluated from the present study results showed that the water criteria (physically, chemically and biologically) should be monitored and taken measures against pollution for the sustainable lake management.