Development of Standard Weight (Ws) Equations for Selected Desert Fishes
Edmond S. Muskie Freedom Support Act, U.S. State Department
October 2001 to June 2002
Scott Bonar, William Matter
Standard weight equations have been developed for fishes throughout North America for use in the relative weight procedure. Examination of relative weights can provide a rapid indication of the well-being of fish in a particular community, and are particularly useful for studying competition or predation. Most standard weight equations have been developed for sport and commercial freshwater species, and few exist for non-game fishes. We are developing standard weight equations for selected desert fish species by contacting researchers and managers across the western United States to obtain length-weight data from various populations of roundtail chub Gila robusta, humpback chub Gila cypha, razorback sucker Xyrauchen texanus and flannelmouth sucker Catostomus latipinnis. These equations will be useful to managers for examining the condition and well-being of these species in various populations. This study is now complete and will appear in the May 2004 issue of the North American Journal of Fisheries Management.