Mississippi River. Of these fishes, 25, 278 individuals were collected from the Illinois 

 WatenA/ay sites, and 643 were collected from Brickhouse Slough of the Mississippi 

 River. These results are similar to the first five years of F-101-R (1989-1993), when 

 60 species of fishes were collected representing 12 families (Lerczak et al. 1995; 

 25). The year with the greatest overall catch of fishes was 1 995 (7941 individuals, 

 CPUEn 325) (Table 8) and the year with the fewest overall catch of fishes was 1994 

 (3421 individuals, CPUEn 131) (Table 6). 



For all stations combined, the greatest number of species were collected in 

 1995 (48 species plus 3 hybrids) and the least were in 1997 (38 species plus 4 

 hybrids) (Tables 8 and 12, respectively). The number of species collected from 

 upper waterway reaches ranged from 12 for Starved Rock in 1996 (Table 10) to 24 

 for Marseilles in 1995 (Table 8). The number of species collected from middle river 

 reaches ranged from 23 for La Grange Reach in 1997 (Table 12) to 34 for Peoria 

 Reach in 1996 (Table 10). The number of species collected from the lower river 

 (Alton Reach) ranged from 18 in 1994 (Table 6) to 25 (Table 8) in 1995. The Peoria 

 Reach consistantly had highest species richness during all years (1994-1998) of 

 sampling. 



Rankings by Relative Abundance . Rankings by relative abundance in 

 number of fish collected per hour highlight the consistent dominance by gizzard shad 

 during all years except 1994, when small cyprinids (emerald shiner and bluntnose 

 minnow) and bluegill were most numerous (Tables 7,9,11,13, and 1 5). Gizzard 



25 



