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Rio YaquiFish Monitoring on San Bernardino NWR
Southwest Region, November 18, 2006
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Rio Yaqui Fish monitoring was completed on San Bernardino and Leslie Canyon NWRs in November.  Overall 20 ponds were trapped on San Bernardino NWR, Black Draw was electro-shocked, and traps were placed in pools in Leslie Creek.  While the data is still in the preliminary stage, we do have some initial data that can be reported.   Asian tapeworm (Bothriocephalus acheilognathi) is still present in large numbers and is present in all ponds on San Bernardino.  Sampling of Yaqui chub (Gila purpurea) showed roughly an 80% infestation of fish.  As for species captured during this monitoring effort we captured six different species of threatened, endangered, or species of concern fish: Yaqui chub, Yaqui topminnow (Poeciliopsis sonoriensis), longfin dace (Agosia chrysogaster), beautiful shiner (Cyprinella Formosa), Mexican stoneroller (Campostoma ornatum), and Yaqui catfish (Ictalurus pricei).  All species except for Mexican stoneroller were found in lotic habitats.  Longfin dace and Yaqui topminnow were the most abundant species found in Black Draw with two Mexican stonerollers also being found in the stretch of Black Draw below the Twin Pond outflow.   The Catfish were caught using trammel nets in House Pond on the Slaughter Ranch.  22 catfish were caught, of which 7 were recaptures.  All catfish were measured and weighed and new fish had a PIT tag placed in them.  There were no fish trapped in Leslie Canyon.  This believed to be due to the relocation of fish from two floods that went through the canyon in August.  However, there were 155 Yaqui chub that were released into Leslie Creek in Novemeber by refuge staff after fish monitoring was completed.

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



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