The commercial trout-rearing industry in the United States is a big and growing industry that has many problems different from those of governmental trout hatcheries. Fish of specific saleable sizes often must be available throughout the year. Such a supply is obtained by utilizing uneven growth of trout, using different egg supplies, crowding and release and adjusting feeding. Pellet feeding has proven useful in the industry. Trout raised commercial usually sell for between $0.85 and $1.25 a pound and this price includes cost of labor, food and maintenance, and necessary profit. Present problems of the industry include depression of the market dumping of trout by marginal producers and competition from imported trout, difficulties in financing trout farms, shortage of hatchery operators and suitable labor, and lack of research on problems of commercial trout production.