Common name. Filyos gudgeon.
Diagnosis. Distinguished from other species of Gobio in Anatolia by: ○ 40–43 total lateral-line scales / ○ chest completely scaled, scales extending forward to or almost to isthmus / ○ head length 26–29 % SL / ○ scales on belly smaller than pupil / ○ caudal-peduncle length 2.1–2.7 times its depth / ○ 5–6 scale rows between anus and anal origin / ○ 8–10 scale rows between posterior extremity of pelvic base and anus / ○ 8–9 mid-lateral blotches. Size up to 111 mm SL.
Distribution. Türkiye: Ulusu in Filyos drainage.
Habitat. Moderately fast-flowing streams and small rivers with sandy or gravelly bottoms.
Biology. No data.
Conservation status. EN; appears to be declining within its very small range. Some food factories around Çerkes heavily pollute the Ulusu.
Gobio kovatschevi; Bakacak, Biga Peninsula, Türkiye; 100 mm SL.
Remarks. Despite its name, this species does not occur in Kızılırmak drainage. The Ulusu was considered a tributary of Kızılırmak, but it belongs to Filyos.
Further reading. Turan et al. 2016a (description); Yoğurtçuoğlu et al. 2020a (distribution).