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'*~- iI- .':.i....Jl "'- ~ _ :.-...J h~", ..Jo- "p ~ '^, ...::.... _-,.,.... ...........,... 6 J -II --.... ill" H ..~::':"-~.L' , t. ---.' ~'''''--'-~---''Io.'''"'''~'''-1f;:y.~' '~~.!C'-":1~ ~_ . Ji'i........."........" " ...=.....Pi~.~_s..~;-r '''.e. .1 ut,,1a Management Although partial control by spot poisoning, using a chemical containing the active ingredient called rotenone, has been carried on for a number of years (Sigler, 1953; Olson, 1959), the only prac- tical means of eliminating huge populations is to attempt a total kill. ~ ! t:. COLORADO CHUB Gila robusta Baird and Girard Common Names: Colorado chub, roundtail, bonytail, Verde trout, Gila trout. :.r' ,. ~. '.C< .r I tl: Importance This very variable species is generally too bony to be of much value as food although large individuals were formerly eaten by Indians, especially along the lower Colorado River where neither trout nor whitefish are native. The young are important as forage fish and also, to a limited extent, as bait. It will take a spinner, doughball, or worm readily and consti- tutes a "sportfish" for youngsters in parts of its range. Range The Colorado chub, as the name implies, is native to the Colo- rado River Basin, occuring from near the mouth of the River in Mexico well up into the headwaters in Wyoming and Colorado. It is decreasing in abundance, however, as the Colorado continues to be modified by man (Miller, 1961). "2 . (:l ~l .j j , <~ , ~~ -"""'~7:" ~.'''i'''?"","",''''''", ~';.. """"'~'"t.' ;<"'r->":l!:l'~ 1,. <.~r".,..".,~~,:~.II1~~~lIlfi ~~!'i"'f"'1F~-'~"""";:'- "