Three-spined stickleback is a fish species of the gasterosteidae or stickleback family. It is wide spread in the northern regions of the Pacific and Atlantic Oceans, in the White Sea and also the water bodies of Europe. It got its name for the three spines located in front of its dorsal fin. It feeds on small crustaceans, roe, insect larvae and fry. Three-spined stickleback's body length varies from 4 to 10 cm, whereas its weight may be up to 10 g.