Svirgsden, R., Albert, A., Rohtla, M., Taal, I., Saks, L., Verliin, A., Kesler, M., Hubel, K., Vetemaa, M. & Saat, T. 2015. Variations in egg characteristics of ruffe Gymnocephalus cernua inhabiting brackish and freshwater environments. Helgoland Marine Research 69, 273−283.
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