Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Scorpaeniformes
(Scorpionfishes and flatheads) > Cottidae
Etymology: Cottus: Greek, kottos = a fish (Ref. 45335); gratzianowi: Named for Valerian Ivanovich Gratzianow [Gratsianov] (1876−1932), the author of the first taxonomic review of Russian fishes "Versuch einer Übersicht der Fische des Russischen Reiches in systematischer und geographischer Hinsicht" (Gratzianow 1907), who described Cottus koshewnikowi. The original latinised spelling of the surname (Gratzianow) was retained.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Temperate
Europe: Ukhtomitsa River in the Onega River drainage, White Sea basin, Russia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.3 cm SL male/unsexed; (Ref. 101366)
Morphology | Morphometrics
(total): 6 - 8;
soft rays: 12 - 13;
Vertebrae: 32 - 34. Cottus gratzianowi is distinguished from all congeners in Europe east of the Meuse (except C. koshewnikowi) in having the following combination of characters: no transverse dark bands on the pelvic fin; a single median chin canal pore; an incomplete lateral line not reaching behind the anal-fin insertion; and lateral line located considerably above the mid-line of the flank. It differs from C. koshewnikowi by a larger eye (horizontal diameter 23?28% HL, equal to or exceeding snout length vs. 16?25% HL, less than snout length), a rounded caudal fin (vs. commonly truncated), frequent presence of one to three branched rays in median part of the pectoral fin (vs. usual absence), an interrupted supratemporal canal commissure with 4 pores (vs. non-interrupted, with 3 pores), the pelvic fin extending to the anus in both sexes (vs. not reaching the anus), a short lateral-line canal extending to below the fifth to tenth ray of the second dorsal fin, with 15?24 pores, with few interruption (vs. commonly extending to below the 9th to 15th ray of the second dorsal fin, with modally 21?27 pores, with few to numerous interruptions), abdominal vertebrae commonly 10 (vs. 11), and contrasting black blotches on all fins including pelvic and anal fins (vs. no blotches on pelvic and anal fins) (Ref. 101366).
During summer, this species is found in a relatively cool small river with moderate to rapid current, gravel and cobble bottom, and not very dense submerged aquatic vegetation (Ref. 101366).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Sideleva, V.G., A.M. Naseka and Z.V. Zhidkov, 2015. A new species of Cottus from the Onega River drainage, White Sea basin (Actinopterygii: Scorpaeniformes: Cottidae). Zootaxa 3949(3):419-430. (Ref. 101366)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00891 (0.00344 - 0.02310), b=3.12 (2.89 - 3.35), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (28 of 100) .