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6 Prairie Naturalist 26(1 ): March 1994 60 Common carp Northern red horse White sucker 19~ 00 19~ 00 1991 50 50 50 40 40 40 30 30 30 10 20 20 20 10 10 40 40 1992 50 40 so 1992 50 30 30 30 20 20 20 UI 1: 10 Cl .~ Qj l: o o .... - ~ 60 u:: 50 10 10 123 4 S 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Longnose sucker 1991 60 SO Channel catfish Smallmouth bass 1991 60 1991 50 40 40 40 30 30 30 10 20 10 10 20 20 50 1992 50 o 1992 50 1992 40 40 40 30 30 30 20 20 20 10 10 10 1 2 3 4 S 6 7 8 1 2 3 4 5 678 Sampling sites 1 234 5 678 Figure 2. Mean catch per unit effort (fish/1 00 net-nights) and standard errors forthe six most abundant species captured with hoop nets in the Laramie River at each sampling site in 1991 and 1992. Clear bars indicate round nets and shaded bars indicate 0 nets. Selectivity for certain fishes is a common phenomenon among different designs of hoop nets (Miller 1945, Starrett and Barnickol1955, Hubert and Schmitt 1982) and knowledge of selectivity has been used by commercial fishers and biologists to target certain species (Carter 1954, Funk: 1958). Among the six most abundant species captured in the Laramie River, the catch rate of northern redhorse in D nets was more than twice that in round nets. Conversely, the catch rate of