Field Notes
U.S. Fish & Wildlife Service
Field Notes Entry   
Rio Grande silvery minnow (Hybognathus amarus) Spawning
Southwest Region, May 3, 2005
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Dexter National Fish Hatchery and Technology Center's (Center) annual spawning of the Rio Grande silvery minnow (RGSM), which were spanned from May 3 to May 26, 2005, resulted in over 250,000 fry. Two hundred and twenty three pair from the 2002-year class broodfish were spawned in four separate sessions. The broodfish used were collected as eggs in the Middle Rio Grande and reared at the Center. The broodfish were brought in from earthen ponds and separated by gender. Both the males and females were given a hormonal injection. The pairs were then placed into circular tanks and the spawning process began. It took roughly 5-7 days from the time that the broodfish were injected to the time the fry were taken back out to the earthen ponds. The Center's success in rearing the RGSM is evident in both its captive stock, the large quantities that are released back into their habitat, and by the numbers shipped to other agencies. Come late fall and early spring, the young fish will be marked and stocked back into the Middle Rio Grande allowing them to adapt to their natural habitat in the hope that they will be ready for the 2006 spawning season.

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