﻿28 
  

  

  FISHES 
  OF 
  THE 
  YELLOWSTONE 
  NATIONAL 
  PARK. 
  

  

  15. 
  SiLVERSiDE 
  Minnow 
  (Leuciscus 
  JiydropMox) 
  . 
  

  

  This 
  little 
  fish 
  is 
  too 
  small 
  to 
  be 
  of 
  much 
  use 
  for 
  other 
  than 
  food 
  

   or 
  bait 
  for 
  trout, 
  attaming 
  a 
  length 
  of 
  only 
  3 
  to 
  5 
  inches. 
  It 
  occurs 
  

  

  

  Fig. 
  15.— 
  Silverside 
  minnow. 
  

  

  in 
  some 
  of 
  the 
  Snake 
  River 
  sources 
  in 
  the 
  park, 
  particularly 
  Heart 
  

   Lake 
  and 
  Witch 
  Creek. 
  It 
  spawns 
  in 
  the 
  spring. 
  

  

  16. 
  LoNGNOSE 
  Dace 
  (Rliinichthys 
  dulcis). 
  

  

  This 
  little 
  fish, 
  attaining 
  a 
  maximum 
  length 
  of 
  only 
  about 
  5 
  

   inches, 
  is 
  food 
  for 
  trout 
  and 
  useful 
  as 
  bait. 
  It 
  is 
  found 
  in 
  Heart 
  

  

  Fig. 
  16. 
  — 
  Longnose 
  dace. 
  

  

  Lake 
  and 
  Witch 
  Creek 
  and 
  also 
  in 
  Gardiner 
  Eiver 
  below 
  Osprey, 
  

   Undine, 
  and 
  Rustic 
  Falls. 
  

  

  17. 
  Dusky 
  Dace 
  {Agosia 
  nuhila). 
  

  

  The 
  little 
  dusky 
  dace, 
  seldom 
  over 
  3^ 
  inches 
  in 
  length, 
  is 
  extremely 
  

   abundant 
  and 
  widely 
  distributed 
  in 
  the 
  Columbia 
  River 
  Basin. 
  In 
  

  

  Fig. 
  17.— 
  Dusky 
  dace. 
  

  

  the 
  park 
  it 
  has 
  been 
  recorded 
  from 
  Heart 
  Lake 
  and 
  Witch 
  Creek. 
  

   It 
  is 
  useful 
  as 
  food 
  for 
  larger 
  fishes 
  and 
  as 
  bait 
  for 
  trout. 
  

  

  