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Fish Hatchery, Bigwater, Utah (Wahweap) are able to produce approximately 2,000 <br />pounds offish per acre. <br />• Survival in hatcheries and grow-out ponds is highly variable.- <br />• Survival estimates used in the State stocking plans are assumed to be accurate.. <br />• Growth rates under hatchery conditions and in leased grow-out ponds are uncertain and <br />typically depend on food availability and fish density. Stocking sizes-could be reached a <br />year earlier (i.e., bonytail at 200 mm total length [TL] before the autumn of the' second <br />growing season; Colorado pikeminnow at 150 mm TL after first full year of growth; and <br />razorback sucker at 300 mm TL by the fall of the second year) if provided with sufficient <br />food and fish at low densities. <br />BONYTAIL <br />Background <br />Bonytail have essentially been extirpated from the system. Dexter National Fish <br />Hatchery and Technology Center, Dexter, New Mexico (Dexter) has maintained a broodstock <br />since the mid 1980's; this broodstock was developed from 10 wild fish that were caught in Lake <br />Mohave in 1981 (Hamman 1982, 1985). Wahweap has been developing a broodstock based on <br />different year classes since 1996. <br />The State of Colorado stocking plan requires bonytail that are greater than 200 mm (8 <br />inches) total length (TL) and the State of Utah stocking plan requires bonytail that average 200 <br />mm TL. Bonytail that are 200 mm TL average in weight around 150 g (5.3 ounces). The State <br />of Colorado stocking plan requires the annual stocking of 24,000 bonytail. These fish can all be <br />raised at the J.W. Mumma Native Aquatic Species Restoration Facility, Alamosa, Colorado <br />(Mumma) with associated local grow-out ponds throughout the San Luis Valley area. The State <br />of Utah stocking plan requires 16,280 bonytail total per year. These fish can all be produced at <br />the Wahweap . <br />2 <br />