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December 2010

Lower Colorado River 2006-2008 Razorback Final Project Report

Portions of the lower Colorado River between Parker and Laguna dams were surveyed during the period January 2006 to April 2008 as part of a broad program to assess efficacy of the stocking program for razorback sucker Xyrauchen texanus. Our findings document that short-term mortality is high and long-term survival is nil because of predation losses to nonnative fishes and to fish-eating birds.

Post-stocking survival of bonytail in Lake Havasu

Though functionally extirpated in the wild, bonytail continue to be stocked into the mainstem lower Colorado River. Lake Havasu serves as one of the primary stocking locations and is unique among all stocking sites because bonytail are occasionally recaptured during routine monitoring trips and by sport fish anglers–a feat that is encountered nowhere else.