Gasterosteiformes is an order of ray-finned fishes that includes the sticklebacks and relatives. Parasite infections can impair the courtship dance of male threespine sticklebacks. Gasterosteus is a genus of sticklebacks. The Gasterosteidae are a family of fish including the sticklebacks. Minnows, sticklebacks, small roach and trout are typical prey. Such behaviour has also been demonstrated in the shoaling behaviour of threespine sticklebacks. The river contains, amongst others, brown trout, sea trout, salmon, eels, minnows, and sticklebacks. Usually, the larger of the two sticklebacks has a higher risk of being attacked. Some evidence indicates the existence of cooperative behavior among three-spined sticklebacks, mainly cooperative predator inspection. These results provide further evidence for a tit-for-tat cooperation strategy in sticklebacks. This has been documented in sticklebacks, gobies, and clownfishes, among others. Experiments with ninespine sticklebacks showed that individuals will use social learning to locate food. During the breeding season, male three-spined sticklebacks defend nesting territories. Oceanic sticklebacks introduced through nearby Cook Inlet recolonized the lake. The lakes themselves only contain three-spined sticklebacks and cutthroat trout, and all are on islands.