7875 - Laserfiche WebLink

Home Browse Search

of the fish. All-fish captured will be weighed (g), measured (total length, mm), and checked for a PIT tag. Fish will be intensively monitored for about two months in the autumn by sampling with hand-held seines, traps, and electrofishing. Sampling for these stocked fish will be discontinued during winter but resumed in the spring prior to runoff and repeated two or three times between runoff and late fall. Initial sampling will begin near the stocking site and move downstream. When fish are stocked in the Gunnison River, sampling will be done from Hartland Diversion Dam downstream to the Colorado River confluence. When fish are stocked in the Colorado River, sampling will be done from Rifle, Colorado downstream to Westwater Wash. Routine monitoring will not be done below Westwater Canyon, at least not initially. However, all stockings will be coordinated with cooperators performing field work in the Gunnison and Colorado rivers. Field workers that encounter razorback sucker during the Interagency Standardized Monitoring Program or during other sampling programs will be requested to inspect any fish encountered for PIT tags and record location of capture and vital statistics for each fish. If introduced razorback suckers are collected from the Colorado River within Utah, an expanded monitoring program could be implemented. The monitoring effort presented here and the protocol developed under the RIP razorback sucker monitoring-plan will be evaluated annually and field sampling will be modified if necessary. Results from these sampling programs will assist managers in evaluating stocking success. Modifications to the propagation program and stocking plan can be made as appropriate. V. REFERENCES Allendorf, F. W. 1993. Delay of adaptation to captive breeding by equalizing family size. Conservation Biology 7:416-419. Anderson, R. 1994. Endangered Fishes. Federal Aid Project SE-319, Job Progress Report, August 1994. Federal Aid in Wildlife Restoration. Colorado Division of Wildlife. Fort Collins, Colorado. 29 pp. + Appendices. Bestgen, K. R. 1990. Status review of the razorback sucker, Xyrauchen texanus. U. S. Dept. of the Interior, Bureau of Reclamation, Upper Colorado Regional Office, Salt Lake City, UT. Burdick, B. D. 1992. A plan to evaluate stocking to augment or restore razorback sucker in the Upper Colorado River. Final Report. Colorado River Fishery Project, U. S. Fish and Wildlife Service, Grand Junction, Colorado. 56 pp. Burdick, B. D. 1995. Ichthyofaunal studies of the Gunnison River, Colorado, 1992-1994. Draft Report. Colorado River Fishery Project, U. S. Fish and Wildlife Service, Grand Junction, Colorado. 11