L. Forró szerk.: Miscellanea Zoologica Hungarica 10. 1995 (Budapest, 1995)

Specziár, A.; Vida, A.: Comparative study of Gymnocephalus cernuus (Linnaeus, 1758) and G. baloni Holcik and Hensel, 1974 (Pisces, Percidae)

2.5 5 7.5 10 12.5 15 current velocity (cm/s) 17.5 20 Fig. l. The effect of the current on the abundance of Gymnocephalus baloni and G. cernuus in spawning time. 2.5 5 7.5 10 12.5 15 current velocity (cm/s) 17.5 20 Fig. 2. The effect of the current on the abudance of Gymnocephalus baloni and G. cernuus out of spawning time. 2 m /pair could be observed in the littoral region. At the same time standing waters were also occupied, but another peak in occurrence could be seen at 7.5 cm/s. (Fig. I). During our collectings (apart from the breeding season, when it was also found on muddy substrate) it could usually be recorded from rocky shores with hollows, and occurred less abundantly on hard sand, clay and gravel bottom.