Of the species known not one has so wide a geographical range, and has so well been studied, as the common British threespined stickleback (Gastrosteus aculeatus).
8, D) capable of living freely in water for at least a week (Bothriocephalus), which then, if eaten by a stickleback, throws off its ciliated envelope, and creeps by the aid of the hooks through the intestinal wall into the body-cavity of the fish.
The development the Stickleback; emb.
noveboracensis, Three-Spined Stickleback.
The ten-spined stickleback (Gastrosteus pungitius) is so called from the number of spines usually composing its first dorsal fin, which, however, may be sometimes reduced to eight or nine or increased to eleven.