Adults inhabit streams and lakes . Males build, guard and aerate the nest where the eggs are deposited .
Distinguished uniquely from congeners in Europe by having a deep notch on the anterior margin of pelvic girdle. Differs further from other members of the genus by having the following combination of characters: trunk with 2-15 scutes; and scutes forming a lateral keel on caudal peduncle or keel absent. Morphological differences are reported in several lakes between individuals occurring in different substrates (mud, lava), especially in Lake Thingvalla .: fusiform / normal.
Behavioural data for Gasterosteus Islandicus is currently being reviewed.
Males build, guard and aerate the nest where the eggs are deposited .
Freshwater; benthopelagic. Temperate
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