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Species details
Internal ID28
Common nameNo common name, Gammarid amphipod
Scientific NameGammarus tigrinus
Scientific NameGammarus cf. tigrinus
Scientific Name acceptedGammarus tigrinus
Aphia ID102296
Aphia ID accepted102296
High GroupCrustacean
Tax info classMalacostraca
Tax info phylumArthropoda
Tax info phylum sourcehttp://www.marinespecies.org/aphia.php?p=taxdetails&id=111538
Tax info familyGammaridae
Tax info orderAmphipoda
Arctic regionSvalbard
Temperature rangeSexual maturity is reached at a small size, egg-bearing females of only slightly more than 4 mm have been observed. This size is reached in 40 days at 10 C, 32 days at 15 C and 27 days at 20 C. The number of eggs in a brood depends on the size of the female. The maximum number of eggs recorded in a brood is 95, and the mean brood size is about 20. Overwintering animals may copulate in winter, and egg-bearing females have been found in early spring at a water temperature of 2 C, although it has been claimed that Gammarus tigrinus cannot reproduce below a temperature of 5 C . Brooding time is 20 days at 10 C, 16 days at 13 C and 9 days at 21 C, and there are three spawning peaks (July, August, October) per year. Life span has been calculated to be about 2 months depending on temperature; overwintering animals live for several months. Presumably one female can have several consecutive broods per season.
Temperature range sourceChambers (1977); (Pinkster, 1975); (Grabowski et al., 2007); (Pinkster et al., 1992) in Jensen, 2000,
Match typeexact
Invasion details
VectorBallast water
Vector introductionBallast water, fish food
Impact indicatorsEcological (Gammarus tigrinus is able to outcompete many native gammarids in oligohaline waters).
Impact indicators sourcejensen 2000
Reference 1Ware et al. 2015
Status (observations from GBIF database)
ballast water observation