Laserfiche WebLink
A total of 15 fish species representing six families <br />was collected by seining and electrofishing. These <br />included seven native (three endemic) and eight exotic <br />(introduced) species. The native speckled dace <br />(I2hinichthys osculus) was the most widely distributed <br />species in seine samples while native bluehead sucker <br />(Catosto~us discobolus) larvae and YOY were the most <br />common fishes except in 1985 when exotic fathead minnows <br />r <br />(Pi~ephales pro~elas) became the most abundant. The <br />overall dominance by fathead minnows in 1985 seine <br />collections was a direct result of their explosive <br />reproduction in Bennev Reservoir. Endemic roundtail chubs <br />(Gila robusta) displayed an apparent decline in seine <br />collections from 1983-85 while endemic flannelmouth <br />suckers (Catostomus Iatininnis) appeared to become <br />slisthtly more abundant. Other species collected by <br />seininr~, native mottled sculpins (Cottus bairdi). and i <br />exotic common carp (Cvnrinus carnio). red shiners <br />(Notronis lutrensis). channel catfish (Ictalurus <br />vunctatus). and black bullheads (Ictalurus ~e1as). <br />were rare or absent. No .larval or YOY Colorado sauawfish <br />were collected. <br />Electrofishing collections were dominated throughout <br />the study by flannelmouth suckers. Colorado squawfish, <br />present in relatively small numbers, comprised only 0.1, <br />0.2, and 0.3~ of the-fish collected while electrofishing <br />to evaluate species composition in 1983, 1984, and 1985, <br />xv <br />