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<br />
<br />Yampa River. Sampling was conducted on the lowerYampa I\i\"'r If; .:
<br />The cntire Yampa River study are;; was sdmplcd in 1971. rnle",;'" '"
<br />June to August was conducted on the lower 4-5 rni of thc Yam!,,, H,....(
<br />1969. The lower 10 mi of rh'er was sampled in 1970. Gill neb of I h, :
<br />and seines were used in the sampling. Electrofishing was condUlI',! ,.
<br />one mile of river each year. In lotc June and late July.Early AIl!:lI!
<br />study area was sampled as follows. The Little Snake River YOi" """,,,'
<br />sites, and Y ampa Canyon of Dinosaur National ;Vlonumcnt allll \111' .1/1',' '
<br />to Juniper Springs was floated, electrofished, and seined at unsp('(:ifi,.d ",!" .
<br />Most fish wcre rcturned although many Colorado squ1l',,'fish. ,llId"
<br />and humpback suckers were preserved when found dead in gill IlI.t,.
<br />Continuous temperature recordings were made in the lower 1''''''1'''
<br />summcrs of 1968,69 lInd 70 with a Bristol modellT501-1A 7.da\' I"'"
<br />mometcl". Turbidity was measured with :J Hach Co. Engineers Kit Ill'"
<br />in t 968.
<br />
<br />
<br />RESULTS. Numbers of fish collected were recorclrd III ~,
<br />terms. Terms used were defined as fol1ows:
<br />Abundant (A) -found in large numbers in an arca. \I-II,';
<br />several age groups present, suggesting a reproducill;'; I"'!'
<br />The species was present in most habitat types or in pxl 11'1""; ,
<br />numbers in one habitat type. Specimens could he folk, "',; .,'
<br />in the area with the proper equipment.
<br />Common (C)-found in relatively low numbers or Dilly ill ...!;..'
<br />type in higher numbers. Usually 1 or2 age groups "en' 1";'1'
<br />and they could be collected with sufficient effort PXI','w\,',l
<br />area.
<br />Scarce (S)-found in an area in small numbers. l;~t1;ilh .<.
<br />age group was represented. Collected only occasionall.\' i11,d
<br />certainty, regardless of effort.
<br />Failure to collect a species lit an area did not ItCCl,,'dIl h
<br />was not present but strongly suggested it was vcry rare.
<br />D%res River. Elewn species were collected in tlte 1)1 Ii,,!,
<br />(Table 1) of which four 'were native species. HoulHltilil (illl\
<br />robus/a), speckled dace (Rhiniehthys osell/us) and flan III'IIJlllll':;
<br />ers (Catoslomlls /atipi171zis) were the most common. Grl'dt.'r l'
<br />of species were found in the lower and upper sections or tilt' /'I'., i
<br />the middle, drier portion.
<br />Yampa River. Twpnty two spccies wcre collert('(l ill tl\l' 'I
<br />River (Tahle 2). Flannelmouth suckprs. bhwhead such 1'- , (',,:
<br />discobo/lIs), speckled dace, roundtail chubs and red~idl' ':1111"1
<br />ardsollius bal/raWs) were the most a bultdan t. Tlil' gn'illt',t ,11\ ' '
<br />species was found in the lower section.
<br />
<br />4.06
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