Field Notes
U.S. Fish & Wildlife Service
Field Notes Entry   
Colorado pikeminnow (Ptychocheilus lucius) Spawning
Southwest Region, May 25, 2005
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The Dexter National Fish Hatchery & Technology Center (Center) held its annual Colorado pikeminnow (pikeminnow) spawning on May 25, 2005. Thirty pairs were spawned from the 1991-year class. The Center currently holds 156 pairs from this year class as broodfish. Each year, approximately 30 pairs are spawned allowing this particular set of broodfish to be spawned once every 5 years, which maintains the existing genetic diversity. Over 2 million eggs were collected from the 30 pairs of pikeminnow. This number is contributed by 90 percent of the females producing eggs--a success in itself as the norm is 75 percent. Approximately 50 percent of the eggs will hatch. The fry will then be stocked in the earthen ponds and reared until they reach 2 inches in length. Once the fry reach the target length, they will be tagged and ready to leave the Center. The Arizona Game and Fish Department will receive 25,000 of the fingerlings as part of a Cooperative Agreement. Another 300,000 will be placed into their natural habitat the San Juan River in Northern New Mexico.

Contact Info: Martin Valdez, 505-248-6599, martin_valdez@fws.gov
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