The Food of Fresh-Water Sticklebacks (Gasterosteus aculeatus and Pygosteus pungitius), with a Review of Methods Used in Studies of the Food of Fishes

The work on which this paper is based began as a study of the food of fresh-water stickleback (section C). In the course of this work it became desirable to review the methods in common use for studying the food of fishes (section B). It also became possible to study the food of roach from the stream in which most of the sticklebacks were collected, and so to examine the food of an entire community of fishes (section D). The various sections, which are closely inter-related, have been placed in their logical order, but some forward references have been unavoidable.