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.
STICKLEBACK, the name applied to a group of small fishes (Gastrosteus) which inhabit the fresh and brackish waters as well as the coasts of the temperate zone of the northern hemisphere.
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).
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.
A small stickleback kept in an aquarium devoured, in five hours' time, 74 newly-hatched dace, which were about a quarter of an inch long.
The sea-stickleback (Gastrosteus spinachia or Spinachia vulgaris) attains to a length of 7 in., and is armed with fifteen short spines on the back.
By this it is brought into contact with the fin of a fish, such as perch, stickleback or others, and effects a hold thereon by means of the toothed edge of its shells.