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28 <br />10~ <br />w <br />} <br />Q Bi <br />J <br />} <br />m <br />N 6i <br />I-L <br />LL <br />O <br />~ 4i <br />Q <br />F <br />Z <br />w <br />U 21 <br />C <br />w <br />a <br />COPEIA, 1990, NO. 1 <br />COLORADO SQUAWflSH <br />^ ww« wy« ® Maa. wy« ~ u <br />Fig. 1. Vertical distribution pattern of Colorado squawfish in six aquariun <br />periods combined). tank 1 =Ptychocheilus Lucius/Catostomus latipinnis, tank 2 <br />promelas, tank 3 =Ptychocheilus Lucius/Notropis lutrensis, tank 4 = Ptychocheil2 <br />tank 5 =Ptychocheilus Lucius/Lepomis cyanellus, tank 6 =Ptychocheilus Lucius/A. <br />Ptychocheilus Lucius, and to some extent, C. lati- <br />pinnis roamed continuously and appeared to be <br />nongregarious. In contrast, Pimephales promelas, <br />N. lutrensis, R. balteatus, and A. melas exhibited <br />varying degrees of schooling behavior, and were <br />10 <br />w <br />e~ <br />m <br />(A al <br />LL <br />w <br />0 <br />~ 41 <br />Q <br />F <br />Z <br />w <br />U 2i <br />w <br />a <br />repeatedly observe <br />tion. Lepomis cyan <br />species and often <br />the water column. <br />melas and L. cyanel <br />SPECIES <br />Fig. 2. Vertical distribution patterns of fishes in aquarium tanks (feeding ahd nonfeeding periods com- <br />bined). CS =Colorado squawfish Ptychocheilus Lucius, FM = flannelmouth suckez Catostomus latipinnis, FH = <br />fathead minnow Pimephales promelas, RS =red shiner Notropis lutrensis, RD ='~redside shiner Richardsonius <br />balteatus, GS =green sunfish Lepomis cyanellus, BB = black bullheadAmeiurus melas. Distribution for Ptychocheilus <br />Lucius pertains to the tank containing Catostomus latipinnis. Distributions of other fishes are from tanks con- <br />taining Ptychocheilus Lucius. ~~ <br />~ u <br />~. <br /> <br /> <br />