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Perciformes/Cottoidei (Sculpins) >
Cyclopteridae (Lumpfishes) > Eumicrotreminae
Etymology: Eumicrotremus: Greek, eu = good + Greek, mikros = little, small + Greek, trema = hole (Ref. 45335).
Eponymy: Professor Dr Konstantin Michailovich Derjugin (1878–1938) was an oceanographer and marine zoologist at Leningrad State University, and manager of the Oceanic Division of the State Hydrological Institute in Leningrad. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 5 - 1038 m (Ref. 117245), usually 5 - 575 m (Ref. 123372). Polar; 84°N - 50°N, 180°W - 180°E (Ref. 117245)
Arctic Ocean: Barents-Laptev Sea and the Beaufort Sea-Greenland.
Barents Sea (except southwestern part while in the northern areas, it can be found up to Spitsbergen and Franz Josef Land); Kara Sea (reaches 80°32N); Laptev Sea (eastwards to 77°46N 131°52E; Beaufort Sea (waters of the Canadian Arctic
Arch., in the Hudson Bay and Baffin Bay off the shores of the Baffin Island); eastern
Greenland (northwards to the Danish Harbor). The southern boundary of the range in
the North-West Atlantic is 60°N.
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 12.7 cm TL male/unsexed; (Ref. 43939)
Dorsal spines (total): 6 - 8; Dorsal soft rays (total): 10 - 13; Anal soft rays: 10 - 13. This species is distinguished by the following characters: first dorsal fin in the form of dense leathery process, does not bend down to the back, trapezoidal in shape; fish 4.0-8.5 cm TL, usually have seven rows of bony plaques in interorbital region; plaques in periorbital and preopercular rows are numerous; bare space in anus area bounded by semicircle of (6) 7-10 bony plaques; number of plaques on body and head (circumpectoral, postbranchial, supraorbital and postorbital, middle and interorbital rows) on average 32.7; distance from anus to beginning of anal fin on average 22% SL; pectoral fin short, on average 50–51% HL. Colouration: when alive (in Laptev Sea), body almost black, with slightly purple tint; without pronounced spots and stripes; lower side of head is dark, rays of D2, A, and P are dark gray; translucent fin membranes D2 and A are not colored; skin under upper caudal row of plaques light; it is a continuous dark band below it; bases of A and C with light spots; belly silvery; peritoneum (inner surface of abdominal cavity) is not pigmented; lining of oral cavity light, dotted (Ref. 123372).
Body shape (shape guide): short and / or deep; Cross section: circular.
Found on mud, gravel or stone bottoms at temperatures below 0° C, with the young occuring in shallower water (Ref. 4701). A benthic species feeding on crustaceans and oikopleura (Ref. 58426). This species usually occurs at depths from 5 to 575 m at high water salinity (34-35 psu), with water temperatures below zero (down to -2.0°С). Recorded in Baffin Bay, down to 1038 m, and the Canadian Arctic at water temperature up to +4.93°C; Barents–Laptev Sea region, usually at the depths from 6 to 280 m, at low (from -1.9° to +1.8°C) mostly negative water temperatures and high salinity (34.03-35.25 psu), often on silt or clay sediments. In the Olenek and Lena rivers' shoals, it is found in the waters with a reduced oxygen content (86-88%), on brown-black sediments, often with a pronounced odor of hydrogen sulfide. It has never been found in the pelagic trawls. The reproduction in the Barents–Laptev Sea region probably takes place in the autumn-winter period, since the females with mature eggs (4-5 mm) are caught in the autumn. In July, the female (6.3 cm TL) from the Barents Sea had immature eggs (<1.3 mm) in the ovaries. An individual (8.5 cm TL) caught in October was with large eggs (up to 4 mm). A female (8.2 cm TL) caught on September 1, 1980, southeast of Franz Josef Land (79°46 N, 63°08 E) was with large mature eggs. In the collections from the Laptev Sea performed in September, the diameter of the eggs in mature females (8.5-10.1 cm TL) was up to 3.5-5.0 mm (IV stage of maturity). For the Canadian Arctic, spawning is reported in late summer and autumn (Ref. 123372).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Chernova, N.V., O.S. Voskoboinikova, O.Yu. Kudryavtseva, S.Yu. Orlova, O.A. Maznikova and A.M. Orlov, 2019. Taxonomic status of the Okhotsk lumpsucker Eumicrotremus ochotonensis (Cyclopteridae, Cottoidei) with redescription of E. derjugini. J. Ichthyol. 59(3):289-306. (Ref. 123372)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
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