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Cottus haemusi (Marinovand Dikov, 1986. Acta Zool. Bulg. 3, 18–23) is an endemic fish speciesthat is restricted to the upper tributaries of the river Vit, NorthwestBulgaria. After its discovery in 1986, no further investigation ofthe C. haemusi population has been conducted. Theaims of the present study were to determine its current populationstatus based on the distribution, abundance and size structure ofthe C. haemusi population and to analyse the mainenvironmental parameters of its habitat. Five upland tributariesand the main river were examined in low-water periods in 2009 and2010. Two-pass electrofishing surveys were performed at 14 sitesto estimate species presence, abundance and size distribution. C.haemusi was only detected in two tributaries of the riverVit: Kostina and Toplja. The current investigation failed to findthe species at previously recorded sites. The total distributionarea of this species is estimated to be 16 200 m2. The observedabundance of the Vit sculpin ranged from 5.6 to 8.4 individuals·100m–2, with a mean of 7.0 individuals·100 m–2.Investigation of the size structure revealed the relatively lowcontribution of one-summer-old individuals. Microhabitat preferencesdid not differ significantly from other European cottidae species.Only a higher percentage of cobbles distinguished sites with sculpinsfrom those without. The restricted distribution and loss of thebullhead population from some localities in the river Vit could beexplained by human disturbance and the deterioration of naturalhabitat. Several protection measures are discussed

Assessment of the conservation status of endemic sculpinCottus haemusi(Cottidae) in the river Vit (Danube Tributary), northwest Bulgaria