This fish which passes under many aliases as the grass pike, the pike of the lakes, the walleyed pike and pickerel of Canada, is an inhabitant of many of the larger waters of our country, and was formerly abundant. It is also known in localities as the Susquehanna and Ohio salmon. There are several species, which at one time were the subjects of a large and valuable trade, and which are still highly prized for their table qualities. Their numbers have, however, greatly diminished. They require a free range of water, and cannot be confined to the narrow limits of private preserves. Their cultivation and extension are solely a matter of general public interest. They spawn early in April, and the eggs if extruded by hand, must be kept in constant motion for an hour and a half. They may be hatched in the shad and Holton boxes, and require thirty one days for development in water at a temperature of 34°. In warmer water they will mature in ten days.