Knipowitschia longecaudata (Kessler, 1877)
Longtail dwarf goby
photo by Naseka, A.M.

Family:  Gobiidae (Gobies), subfamily: Gobionellinae
Max. size:  5 cm TL (male/unsexed); 3.5 cm TL (female)
Environment:  demersal; freshwater; brackish; marine
Distribution:  Eurasia: Brackish portions of the Black Sea, Sea of Azov and Caspian Sea.
Diagnosis:  Dorsal spines (total): 6-8; Dorsal soft rays (total): 7-9; Anal spines: 1-1; Anal soft rays: 8-9. This species is distinguished from its congeners by the following characters: upper part of caudal fin longer than the lower part; anterior extremity of anterior oculoscapular canal in front of middle of eye; no posterior oculoscapular canal; back unscaled in front of origin of second dorsal; breeding males with 4-8 dark bars when alive; total scales in midlateral series 33-40 (Ref. 59043).
Biology:  Occur in shallow water, on sand and among weeds (Ref. 4696). Live less than 2 years. Feed on small benthic invertebrates (Ref. 59043). Spawn after first winter. Females may spawn several times during a season. Males defend eggs in cavities under stones, plant material or molluscs shells (Ref. 59043) like underside of lamellibranch valves (Cardium, Monodonta, Unio, etc.) (Ref. 4696). Eggs hatch at 3.0-3.8 mm (Ref. 59043).
IUCN Red List Status: Least Concern (LC); Date assessed: 01 January 2008 Ref. (130435)
Threat to humans:  harmless


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