Scaphirhynchus Conference: Alabama, Pallid, and Shovelnose Sturgeon

St. Louis, Missouri, 11-13 January 2005

42.  EVALUATION OF GEAR EFFICIENCY AND BIAS FOR SHOVELNOSE STURGEON (SCAPHIRHYNCHUS PLATORYNCHUS) ON THE LOWER MISSOURI RIVER

Wyatt Doyle*, Columbia Fishery Resources Office (USFWS), 101 Park DeVille Dr. Columbia, MO 65203; Phone 573-234-2132; FAX 573-234-2182; wyatt_doyle@fws.gov

Craig Paukert, Kansas Cooperative Fish and Wildlife Research Unit, USGS/Kansas State University, 205 Leasure Hall, Manhattan, KS 66506; Phone 785-532-6522; FAX 785-532-7159; cpaukert@ksu.edu

We analyzed mean size of shovelnose sturgeon collected in experimental multifilament gillnets (1.5, 2, 3 and 4 inch bar), 1 inch. X 8 inch bar multifilament trammel nets and 3.4 inch bar X 16 ft otter trawls to determine biases related to gears.  All mesh sizes and gears were statistically different except 2 and 4 inch mesh in gillnets.  Although statistically different, all gears appeared to collect larger fish and trawls captured the widest range of fish (20-710mm).  Trammel nets and trawls were much more likely to catch juvenile sturgeon than gillnets.  Additional results will include comparisons of 1 inch gillnets and power analyses to estimate adequacy of gear efforts.