124 Steven I. McBride and Donald Tarter 



Ohio, and Mason County, West Virginia (U. S. Army Corps of Engi- 

 neers 1980a). The Gallipolis pool extends 67.6 km (42 mi.) upriver to 

 Racine Locks and Dam and 49.4 km (31 mi.) up the Kanawha River to 

 Winfield Locks and Dam. The Gallipolis Dam marks the northern 

 boundary of the Greenup navigational pool, which extends 75.8 km (62 

 mi.) downriver to Greenup Locks and Dam. The floodplain of the river 

 at the Gallipolis Dam is slightly more than 1.61 km (1 mi.) wide. The 

 river channel has an average width of 366 m, and its depth varies from 

 approximately 7 to 10 m, with a navigable depth of 2.7 m (U. S. Army 

 Corps of Engineers 1980b). 



Specimens were collected from several locations in the Greenup 

 pool and once from inside Belleville Locks and Dam. However, the 

 main collecting site was situated just below Gallipolis Locks and Dam. 

 This area is steeply sloped and becomes very rocky, then levels toward 

 the shoreline. Approximately 2 m from shore a submerged concrete wall 

 runs parallel with the shoreline for nearly 100 m. This wall provides an 

 excellent habitat for many types of aquatic life and fish are attracted to 

 the area. 



Methods 



Three methods were used to collect sauger. A weekly creel survey 

 of Gallipolis Locks and Dam conducted by the authors from 15 March 

 1981 through April 1982. Surveys resulted in 99 sauger stomachs, 

 donated by cooperative anglers. At various times during the study, gill 

 netting was conducted in the Gallipolis pool as a supplement to the creel 

 survey. Twelve days of netting yielded 18 sauger. Rotenone sampling 

 was done at Belleville Locks on 30 September 1981 in conjunction with 

 the Ohio River Valley Water Sanitation Commission (ORSANCO) and 

 the West Virginia Department of Natural Resources (WVDNR). Thirty- 

 four sauger were obtained, 



Sauger and/ or sauger stomachs were transported on ice to the 

 laboratory, then frozen. Specimens were later thawed, and total length 

 of each fish measured to the nearest mm. Stomachs were excised and 

 their contents washed into a watch glass for sorting into various taxo- 

 nomic categories with the aid of a dissecting microscope. The number of 

 individuals in each taxon was recorded for each stomach. Standard tax- 

 onomic keys were used for identifications (list of references is available 

 from authors). 



The following calculations were made for each monthly collection: 

 (1) percentage of stomachs in which a particular taxon occurred (per- 

 centage frequency of occurrence), (2) percentage of the total number of 

 food items that one taxon comprises, and (3) percentage of the total 

 volume (by weight) of all taxa made up by the combined assigned 

 weight of each particular taxon. 



