﻿FISHES 
  OF 
  THE 
  YELLOWSTONE 
  NATIONAL 
  PAKK. 
  11 
  

  

  bluish 
  or 
  greenish 
  olive, 
  sides 
  silvery 
  with 
  a 
  varying 
  number 
  

   of 
  X- 
  shaped 
  or 
  crescentic 
  black 
  spots; 
  sides 
  of 
  head 
  with 
  

   roundish 
  black 
  spots; 
  tip 
  of 
  pectoral 
  blackish; 
  anal 
  and 
  tail 
  

   fins 
  unspotted, 
  varying 
  much 
  in 
  coloration 
  in 
  different 
  waters. 
  

  

  Loch 
  Leven 
  trout, 
  5. 
  

   hh. 
  Scales 
  in 
  lengthwise 
  series 
  about 
  115 
  fully 
  developed; 
  21 
  to 
  23 
  

   in 
  oblique 
  series 
  from 
  lateral 
  line 
  to 
  upper 
  base 
  of 
  ventral. 
  

   Color 
  very 
  variable 
  but 
  typically 
  greenish 
  olive 
  on 
  back, 
  sil- 
  

   very 
  on 
  sides; 
  belly 
  white; 
  irregular 
  black 
  spots 
  on 
  back 
  and 
  

   sides; 
  sometimes 
  two 
  rows 
  on 
  base 
  of 
  dorsal 
  fin; 
  none 
  on 
  tail; 
  

   variable 
  number, 
  but 
  usually 
  three 
  or 
  four 
  roundish 
  black 
  

   spots 
  on 
  gill 
  cover. 
  Young 
  often 
  with 
  unocellated 
  bright 
  red 
  

  

  spots 
  along 
  sides 
  Landlocked 
  salmon, 
  6. 
  

  

  gg. 
  Body 
  comparatively 
  short 
  and 
  deep; 
  scales 
  in 
  lengthwise 
  series 
  

   about 
  120, 
  and 
  about 
  30 
  in 
  oblique 
  series. 
  Dark 
  colored, 
  olive 
  

   or 
  brownish, 
  with 
  numerous 
  irregular 
  black 
  or 
  dark 
  brown 
  spots 
  

   above 
  lateral 
  fin 
  below; 
  usually 
  ocellated 
  red 
  spots 
  along 
  side; 
  

   orange 
  or 
  yellow 
  margin 
  on 
  upper 
  part 
  of 
  dorsal 
  and 
  anal 
  and 
  

   outer 
  part 
  of 
  ventral. 
  Light-colored 
  young 
  much 
  resemble 
  

   young 
  landlocked 
  salmon 
  but 
  distinguished 
  by 
  the 
  red 
  spots 
  

  

  having 
  bluish 
  areolas 
  Brown 
  trout, 
  7. 
  

  

  dd. 
  Scales 
  in 
  longitudinal 
  series 
  usually 
  200 
  or 
  more. 
  No 
  black 
  spots 
  what- 
  

   ever. 
  

  

  i. 
  Scales 
  in 
  longitudinal 
  series 
  usually 
  200 
  or 
  more 
  (180-205); 
  

   never 
  any 
  ocellated 
  red 
  spots 
  on 
  sides; 
  no 
  rivulations 
  on 
  

   back, 
  dorsal 
  fin, 
  or 
  tail. 
  Tail 
  always 
  strongly 
  forked. 
  Colora- 
  

   tion 
  extremely 
  variable, 
  generally 
  grayish 
  or 
  yellowish 
  gray, 
  

   profusely 
  covered 
  with 
  round 
  pale 
  spots, 
  sometimes 
  almost 
  

   white, 
  again 
  deep 
  orange, 
  usually 
  pale 
  yellow; 
  yellowish 
  

   spots 
  on 
  dorsal 
  and 
  jjartial 
  dusky 
  cross 
  bars 
  on 
  upper 
  and 
  lower 
  

   basal 
  half 
  of 
  tail. 
  Young 
  sometimes 
  with 
  faint 
  mottling 
  on 
  

  

  back 
  slightly 
  resembling 
  the 
  brook 
  trout 
  Lake 
  trout, 
  8. 
  

  

  ii. 
  Scales 
  in 
  lengthwise 
  series 
  215 
  to 
  230; 
  red 
  spots 
  on 
  sides 
  always 
  

   ocellated 
  with 
  bluish; 
  back 
  usually 
  yellowish 
  gray 
  and 
  

   always 
  vermiculated 
  or 
  rivulated 
  with 
  dusky; 
  dorsal 
  and 
  

   tail 
  with 
  wavy 
  dusky 
  bars 
  and 
  rivulations; 
  pectorals, 
  ventral, 
  

   and 
  anal 
  reddish 
  with 
  white 
  outer 
  rays 
  margined 
  behind 
  by 
  

   a 
  narrow 
  black 
  streak. 
  Coloration 
  highly 
  variable 
  with 
  age, 
  

  

  locality, 
  and 
  season 
  Eastern 
  brook 
  trout, 
  9. 
  

  

  AA. 
  No 
  adipose 
  fin; 
  one 
  or 
  two 
  dorsal 
  fins. 
  

   a\ 
  Dorsal 
  fins 
  more 
  or 
  less 
  continuous, 
  the 
  anterior 
  of 
  spines 
  or 
  simple 
  unjointed 
  

   rays; 
  the 
  posterior 
  of 
  soft 
  or 
  jointed 
  rays. 
  

   V 
  . 
  Anterior 
  dorsal 
  composed 
  of 
  strong 
  sharp 
  spines. 
  General 
  color, 
  dark 
  green 
  

   above, 
  sides 
  and 
  belly 
  greenish; 
  an 
  irregular 
  blackish 
  stripe 
  along 
  the 
  

   side 
  from 
  opercle 
  to 
  middle 
  of 
  base 
  of 
  tail, 
  growing 
  indistinct 
  and 
  disappear- 
  

   ing 
  with 
  age; 
  three 
  oblique 
  dark 
  stripes 
  across 
  cheek 
  and 
  gill 
  covers; 
  some 
  

   dark 
  spots 
  above 
  and 
  below 
  lateral 
  line. 
  Coloration 
  somewhat 
  variable 
  

  

  and 
  quickly 
  changeable 
  Black 
  bass, 
  10. 
  

  

  hV. 
  Anterior 
  dorsal 
  composed 
  of 
  weak 
  flexible 
  spines 
  or 
  simple 
  rays; 
  small 
  curved 
  

   hook 
  at 
  edge 
  of 
  gill 
  cover. 
  Coloration 
  olivaceous, 
  everywhere 
  punctulate 
  

   with 
  dark 
  spots, 
  conspicuous 
  on 
  top 
  of 
  head, 
  four 
  or 
  five 
  dark 
  blotches 
  on 
  

   back 
  suggesting 
  cross 
  bars; 
  dorsal, 
  pectorals, 
  and 
  tail 
  with 
  wavy 
  streaks 
  and 
  

   series 
  of 
  spots; 
  anal 
  and 
  ventral 
  white, 
  or 
  sometimes 
  dusky 
  Blob, 
  11. 
  

  

  