Threespine Stickleback
Threespine stickleback
Scientific Name Gasterosteus aculeatus
Conservation Status Least Concern
Family Chordata
Habitat North Pacific and Atlantic Rims
Food Plankton and Small fish

The three-spined stickleback, Gasterosteus aculeatus, is a fish native to much of northern Europe, northern Asia and North America. It has been introduced into parts of southern and central Europe, including Belgium, where the species was featured on a 14-franc postage stamp issued in Belgium in 1990.

The anadramous form spends most of its adult life eating plankton and fish in the sea, and returns to freshwater to breed.