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Projects, Page 2

Current or completed Marsh & Associates projects

Survival of Razorback Sucker Stocked into the lower Colorado River

Status:  Completed

Razorback sucker have been stocked into the lower Colorado River for nearly 30 years, but stocking was accelerated in recent years to meet requirements of a U.S. Fish and Wildlife Service Biological Opinion of lower river operations (USFWS 1997).  The purpose of this project was to assess survival of stocked fish by performing an intensive, opportunistic survey that targeted razorback sucker in approximately 282 km of river from Parker Dam downstream to Yuma.  

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.

Razorback sucker studies on Lake Mohave, AZ-NV

Status: Ongoing

During the few years of Lake Mohave’s filling after the closure of Davis Dam in 1951, the razorback sucker experienced a local population boom within the new lake. It is suspected that the big river fishes inundated the historical floodplains and the isolated lakes and ponds provided ample nursery habitat and a refuge from predation.