Increasing the number of walleye fry stocked in lined ponds can improve the harvest of fingerling walleye. A study at Blue Dog State Fish Hatchery in South Dakota found that as fry stocking density increased from 234,375 to 703,125 per hectare, harvest metrics for number and yield improved. The study also showed that there was a tradeoff between fish size and harvest density, with smaller reductions in fish size as harvest density increased. Overall, increasing fry stocking density led to more efficient rearing, higher yields, and a shorter culture period for walleye in lined ponds.