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Bubbling Ponds State fish Hatchery Bubbling Ponds Fish Hatchery in Arizona does not maintain razorback sucker broodstock on site. Razorback suckers are received either as juveniles from Willow Beach National Fish Hatchery or as newly-hatched larvae from Dexter National Fish Hatchery. Larval fish are typically placed into an unfertilized, unlined, 0.25 acre pond in the spring. In September, the pond is harvested by draining the pond and seining. All fish that have reached the target size (300 nun TL) are stocked. Fish that are too small to stock are split up equally between the six remaining grow-out ponds at an average density of about 5,000 -7,000 fish per pond. Fish are fed by hand at approximately 2.5% body weight, split between morning and evening feedings. Fish are either fed a catfish diet made by Rangen@ that is enriched with spirulina and krill, or razorback sucker diet, made by Silvercup@ depending.on availability. Fish are monitored visually and by sampling using a cast net When a large number of fish have grown to the target size they are harvested by draining the pond and seining. Fish are again sorted by hand and the largest fish are stocked. Fish that have not reached the target size are returned to the ponds for further grow-out On average it takes one to two years for fish to reach the target size with fish growing an average of 0.6 mm/day. Target numbers for production are 12,000 razorback suckers annually (300 nun TL). The biggest difficulty in rearing razorback suckers at Bubbling Ponds Fish Hatchery is protozoan parasite infestations (Ich) and associated bacterial infections that come from an open spring source that is inhabited by mosquito fish, Dexter National Fish Hatchery Dexter National Fish Hatchery maintains four separate razorback sucker broodstocks. These fish are spawned on site and larval fish are placed directly into 0.1