﻿12 
  FISHES 
  OF 
  THE 
  YELLOWSTONE 
  NATIONAL 
  PARK. 
  

  

  aa\ 
  Dorsal 
  fin 
  single, 
  the 
  fully 
  developed 
  rays 
  all 
  soft 
  and 
  jointed. 
  

  

  c'. 
  Mouth 
  wholly 
  inferior 
  with 
  thick 
  papillose 
  lips, 
  especially 
  the 
  lower 
  lip. 
  

   d''. 
  Scales 
  in 
  lengthwise 
  series 
  very 
  small, 
  reduced 
  and 
  crowded 
  anteriorly, 
  

   90 
  to 
  110. 
  Snout 
  long. 
  Coloration 
  dusky 
  brown, 
  sometimes 
  with 
  a 
  

  

  broad 
  red 
  flush 
  or 
  irregular 
  stripe 
  Longnose 
  sucker, 
  12. 
  

  

  dd\ 
  Scales 
  in 
  lengthwise 
  series 
  70 
  to 
  72, 
  not 
  particularly 
  reduced 
  or 
  crowded 
  

   anteriorly. 
  Snout 
  not 
  long. 
  Coloration 
  blackish 
  above, 
  males 
  with 
  

   more 
  or 
  less 
  rosy 
  flush 
  or 
  stripe 
  in 
  breeding 
  season 
  . 
  . 
  Rosyside 
  sucker, 
  13. 
  

   cc^. 
  Mouth 
  more 
  or 
  less 
  terminal 
  or 
  oblique, 
  sometimes 
  slightly 
  inferior, 
  but 
  lips 
  

   never 
  thick 
  or 
  pajnllose. 
  

   e^. 
  Mouth 
  oblique. 
  

   /^. 
  Anal 
  rays 
  8; 
  scales 
  in 
  lengthwise 
  series 
  55 
  to 
  G!'; 
  mouth 
  very 
  oblique 
  

   lower 
  jaw 
  somewhat 
  projecting. 
  Coloration 
  blackish, 
  everywhere 
  

   dark; 
  scales 
  much 
  dotted 
  and 
  with 
  dark 
  edges; 
  often 
  forming 
  lines 
  

  

  along 
  the 
  rows 
  of 
  scales. 
  Males 
  without 
  red 
  .Chub, 
  14. 
  

  

  ff''. 
  Anal 
  fin 
  rays 
  10 
  to 
  13, 
  usually 
  10 
  or 
  11; 
  scales 
  about 
  58, 
  mouth 
  

   oblique, 
  short, 
  jaws 
  about 
  equal. 
  Coloration 
  greenish 
  silvery; 
  

   the 
  back 
  dusky; 
  a 
  dark 
  blue 
  or 
  blackish 
  lateral 
  band 
  between 
  two 
  

   silvery 
  stripes; 
  the 
  lateral 
  band 
  and 
  below 
  bright 
  orange-red 
  in 
  

   the 
  males, 
  the 
  red 
  usually 
  ceasing 
  at 
  front 
  of 
  anal 
  ; 
  a 
  bright 
  silvery 
  

   or 
  golden 
  crescent 
  on 
  chubs; 
  a 
  golden 
  streak 
  from 
  snout 
  above 
  eye 
  

   to 
  gill 
  opening. 
  Very 
  pale 
  in 
  alkaline 
  waters. 
  

  

  Silverside 
  minnow, 
  15. 
  

   ee^. 
  Mouth 
  subinferior. 
  

  

  g\ 
  Upper 
  jaw 
  not 
  protractile, 
  the 
  upper 
  lip 
  continuous 
  with 
  the 
  skin 
  

   of 
  the 
  forehead, 
  muzzle 
  long 
  and 
  projecting, 
  color 
  silvery, 
  darker 
  

   above 
  ; 
  a 
  dusky 
  lateral 
  shade 
  most 
  distinct 
  in 
  young, 
  males 
  largely 
  

  

  rosy 
  Longnose 
  dace, 
  16. 
  

  

  gg''. 
  Upper 
  jaw 
  protractile, 
  i. 
  e., 
  the 
  upper 
  lip 
  capable 
  of 
  being 
  drawn 
  

   out 
  from 
  the 
  snout; 
  muzzle 
  not 
  particularly 
  long. 
  Color 
  usually 
  

   dark 
  grayish 
  above 
  becoming 
  paler 
  below, 
  a 
  faint 
  lateral 
  band 
  

   of 
  dark 
  extending 
  through 
  the 
  eye 
  and 
  around 
  snout. 
  

  

  Dusky 
  dace, 
  17. 
  

  

  1 
  . 
  Montana 
  Grayling 
  ( 
  TliymaTlus 
  montanus) 
  . 
  

  

  The 
  Montana 
  grayling 
  originally 
  existed 
  only 
  in 
  tributaries 
  of 
  the 
  

   Missouri 
  River 
  above 
  Great 
  Falls. 
  

  

  In 
  the 
  park 
  it 
  occurs 
  naturally 
  in 
  Madison 
  and 
  GaUatin 
  Rivers 
  and 
  

   branches, 
  Fan 
  Creek, 
  Grayhng 
  Creek, 
  and 
  the 
  Firehole 
  River 
  below 
  

   the 
  falls. 
  It 
  is 
  reported 
  as 
  very 
  abundant 
  at 
  the 
  junction 
  of 
  Firehole 
  

   and 
  Gibbon 
  Rivers. 
  It 
  is 
  said 
  to 
  ascend, 
  in 
  summer, 
  as 
  far 
  as 
  Fire- 
  

   hole 
  Falls 
  and 
  to 
  be 
  found 
  in 
  the 
  Gallatin 
  River 
  in 
  the 
  northwestern 
  

   part 
  of 
  the 
  park. 
  

  

  The 
  Montana 
  grayling 
  is 
  a 
  most 
  graceful 
  and 
  beautiful 
  fish, 
  of 
  

   shapely 
  proportions 
  and 
  exquisite 
  coloration. 
  The 
  adult 
  averages 
  

   from 
  10 
  to 
  12 
  inches 
  in 
  length 
  and 
  from 
  about 
  J 
  to 
  1 
  pound 
  in 
  weight. 
  

  

  It 
  prefers 
  swift, 
  clear, 
  pure 
  streams, 
  with 
  gravelly 
  or 
  sandy 
  bottom. 
  

   It 
  is 
  quite 
  gregarious, 
  lying 
  m 
  schools 
  in 
  the 
  deeper 
  pools, 
  in 
  plain 
  

   sight, 
  and 
  not, 
  like 
  the 
  trout, 
  concealed 
  under 
  bushes 
  and 
  overhang- 
  

   ing 
  banks. 
  In 
  search 
  of 
  food, 
  which 
  consists 
  principally 
  of 
  insects 
  

  

  