This study was carried out in the Küçük Menderes River basin in order to determine the water quality and investigate the environmental quality and the applicability of both the Biological Monitoring Working Party (BMWP) and Average Score Per Taxon (ASPT). Monitoring took place in May, July and September 2014 at 10 stations (7 rivers and 3 lakes) according to the method of Intercalibration Common Metrics. Some metrics (BMWP, ASPT, Family Biotic Index, Simpson Diversity Index, Shannon-Wiener Diversity Index, Margalef Diversity Index, dominance, frequency and existence of sensitive species) were calculated. In total, 69 taxa comprising 5,814 individuals were detected. The taxa having the highest frequency rate were

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This study is combined the data from two different studies that carried out different regions and time, presenting some information on the population structure (dominance, local distribution etc.) of Potamopyrgus antipodarum (Gray, 1843). According to our data, this species was found in the four different localities in the Delice River with various population densities. However, only of small population was found in the Kocabaş Stream. This species was the second dominant species in the Delice River with 31.43 % after Physella acuta (Draparnaud, 1805) (46.88%). On the other hand, the species was not reached noticeable aggregates in the Kocabaş Stream. In this paper, supporting factors that paving the way P. antipodarum invasion are discussed for the study area.

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Selectivity parameters of gillnets used for fish catching are very important for fisheries management in lakes. The main purpose of the present study was to estimate the selectivity parameters of monofilament gill nets mesh size of 56, 64 and 72 mm (stretched mesh size) used for European chub (Leuciscus cephalus L.1758) in Atikhisar Reservoir, Canakkale, Turkey. The indirect method proposed by Holt was used for the estimation of the selectivity parameters. The common selection factors and common standard deviation of monofilament gill nets were determined as 4.25 and 2.37, respectively. For sustainable fisheries of European chub, the minimum mesh size of monofilament gill nets must be greater than 47 mm stretched mesh size.