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Summary Length–length and length–weight relationships were studied for four endemic Cyprinid species from the Küçük Menderes River Basin located in the Western Anatolian region of Turkey. Fish were sampled from Tahtalı and Beydağı reservoirs, Bulgurca, Şaşal and Azmak streams during 2013–2014, using multimesh gillnets in the reservoirs and by electrofishing in the streams. First records of length–weight relationships for Barbus pergamonensis Karaman, 1971, Squalius kosswigi (Karaman, 1972) and Petroleuciscus smyrnaeus (Boulenger, 1896) are reported in addition to three new maximum total lengths for Chondrostoma holmwoodii (Boulenger, 1896), Squalius kosswigi (Karaman, 1972) and Petroleuciscus smyrnaeus (Boulenger, 1896).

Seasonal changes in phytoplankton community structure, chlorophyll a and some physico-chemical features of Lake Mogan were studied during one-year period, from October 2005 to October 2006. The collected data were compared with the data in previous and recent studies. The nutrient concentrations in the lake were observed to increase with inputs of domestic wastewaters in to the lake in the last years. Chlorophyta and Cyanobacteria in the phytoplankton community in the lake were identified to be dominant together. Merismopedia minima, Microcystis aeruginosa, Sphaerocystis schroeteri and Dictiyosphaerium pulchellum were dominant during the warm period (May -October). Cyanobacterial blooms in the lake were observed in May, which is characteristic for eutrophic lakes in northern temperate region. Changes in phytoplankton community structure, Chl a peak and nutrient concentrations indicated that the trophic level of the lake is still eutrophic.

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