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Hubert and Patton: Fish Catches with Hoop Nets 7 60 Common carp Northern redhorse White sucker 1991 60 1991 60 1991 50 50 50 40 30 40 40 30 30 10 10 10 20 20 20 50 1992 50 1992 50 1992 20 30 20 20 40 40 40 30 30 '" 1: 10 .~ 0 I May 'lii c:: g :2 60 '" u: 50 10 10 o June July August May June July August May June July AU9ust Longnose sucker Channel catfish Smallmouth bass 1991 60 50 1991 60 50 1991 40 40 40 30 20 30 30 20 20 10 10 10 o o 1992 so 1992 50 1992 50 40 40 40 30 20 30 30 o 20 20 10 10 10 o May June July August May June July August May June July August Sampling month Figure 3. Mean catch per unit effort (fish/1 00 net-nights) and standard errors for the six most abundant species captured with hoop nets in the Laramie River for May, June, July, and August in 1991 and 1992. Clear bars indicate round nets and shaded bars indicate 0 nets. smallmouth bass in round nets was 3-4 times greater than in D nets during the two years. Selectivity was not observed for any of the other four abundant species. Environmental factors influence catch rates by hoop nets, with different factors affecting catches of various species (Mayhew 1973, Hubert and Schmitt 1982). There were substantially different catch rates between the two sampling years with higher catches of common carp, channel catfish, and smallmouth bass,