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<br />;1' ~ _ - <br />, I . .. <br />),,~1 <br /> <br />\j'.... <br />;-, <br />s--. <br />........ <br /> <br />>- <br />~ <br />'-oJ <br />\: <br />~ <br />..... <br />...... <br />~ <br /> <br />~ <br /> <br />{VI i nc k\pt I . c.o . l,c,>l" I (if) I ~t>K) / <br />~ J I Llk h~1 <br />I Q1QAIJDITIONAL STUDIES ON THE LITTLE COLORADO RI~R <br /> <br />~'. tJ]1~' , <br />m ,'Vlk le:j <br />10,14 <br />.1f 7/f/ <br /> <br />~r-.T"\ol'T AmTr\"T n"'G" mTTT:" UTp...~nD ^ f"V' f"UT1'O <br />.l\,;1'""uLril..LU1"oJ V.L ..i..i1L l1Ul.J.~ .un.V.l.~ VJ.1UJ..J. <br /> <br />by <br /> <br />C. o. Minckley <br />Biology Department <br />Museum of Northern Arizona <br />Flagstaff, Arizona <br />. December 1979 <br /> <br />Introduction <br /> <br />Information pertaining to the humpback chub, Gila cypha, <br />has become increasingly available during recent years <br />however, much is yet to be learned about this native species. <br />The purpose of 'this current survey was to determine the <br />reoroductive success of this species during 1979, as well as <br />to~obtain additional information on the Little Colorado <br />River population of this species. <br /> <br />Materials and Methods <br /> <br />This current research, conducted during 13-15 July 1979, <br />was airbased, with the research team arriving at the mouth <br />of the Ltttle Colorado River on the afternoon of the 13th. <br />Collections were made using trammel and gill nets, and by <br />seining. Two areas were trammel netted, site I, which was <br />in the main channel of the Little Colorado River adjacent <br />and parallel to the main island and site II which was the <br />smaller downstream channel of the Little Colorado River. Hump- <br />back chubs over 15 cm in total length were tagged using <br />consecutively numbered fingerling tags. Fish were tagged <br />using the Willow Beach method, as well as the Minckley <br />method. Total lengths, sex, and weights were recorded for <br />all fish taken, where feasible. Relative densities of <br />fish were estimated by determining the area seined and <br />expressing the data in terms of the number of fish per. <br />hectare. Relative abundance was determined by ranking fish <br />in their order of abundance in the total collection of fishes. <br />Additionally, all fish were examined for ectoparasites. <br /> <br />Results and Discussion <br /> <br />Reproduction Successful reproduction was confirmed by <br />the collection of 12 fish ranging in total length from 25- <br />44 mm. The majority of these fish were taken .4 km upstream <br />in the Little Colorado River, although two fish were collected <br />in the vicinity of trammel net Site II. <br /> <br />Although reproductive activities have yet to be observed, <br />it is apparent based on this survey, and others (Carother~ <br />