﻿8 
  FISHES 
  OP 
  THE 
  YELLOWSTONE 
  NATIONAL 
  PARK. 
  

  

  embryo. 
  This 
  passes 
  into 
  tlio 
  trout, 
  where 
  it 
  becomes 
  established 
  

   and 
  assumes 
  the 
  form 
  commonly 
  observed. 
  The 
  fish 
  is 
  eaten 
  by 
  

   the 
  pelican, 
  and 
  in 
  the 
  intestinal 
  tract 
  of 
  this 
  bird 
  the 
  parasite 
  attains 
  

   its 
  adult 
  and 
  reproductive 
  stage, 
  and 
  its 
  round 
  of 
  life 
  is 
  there 
  com- 
  

   pleted. 
  The 
  eggs 
  pass 
  from 
  the 
  bird 
  into 
  the 
  water, 
  and 
  a 
  new 
  

   generation 
  is 
  begun. 
  

  

  This 
  parasitism 
  of 
  the 
  trout 
  is 
  of 
  much 
  concern 
  to 
  (lie 
  angler 
  

   because 
  the 
  fish 
  thus 
  afl'ected 
  are 
  likely 
  to 
  bo 
  lazy 
  or 
  inactive. 
  To 
  

   the 
  consumer 
  such 
  fish 
  are 
  more 
  or 
  less 
  objectionable, 
  not 
  only 
  

   because 
  they 
  are 
  "wormy," 
  for 
  the 
  worm 
  is 
  a 
  "tapeworm" 
  of 
  

   proverbial 
  aversion 
  and 
  dread, 
  but 
  because 
  the 
  fish 
  are 
  sometimes 
  

   deteriorated 
  in 
  quality 
  and 
  flavor 
  and 
  considered 
  unfit 
  to 
  eat. 
  To 
  

   the 
  fish 
  culturist, 
  whose 
  concern 
  comprises 
  both 
  of 
  the 
  foregoing, 
  

   there 
  is 
  the 
  fear 
  of 
  spreading 
  the 
  infection 
  to 
  other 
  waters. 
  As 
  the 
  

   most 
  seriously 
  affected 
  trout 
  are 
  found 
  in 
  the 
  warmer 
  waters, 
  the 
  

   angler 
  can 
  get 
  some 
  relief 
  by 
  fisliing 
  in 
  cool 
  waters. 
  

  

  As 
  an 
  answer 
  to 
  the 
  query 
  of 
  the 
  consumer, 
  it 
  may 
  be 
  said 
  tliat 
  no 
  

   known 
  tapeworm 
  for 
  the 
  adult 
  of 
  which 
  man 
  acts 
  as 
  host 
  finds 
  its 
  

   intermediate 
  host 
  in 
  fishes. 
  Furthermore, 
  as 
  cooking 
  destroys 
  the 
  

   vitality 
  of 
  the 
  worm, 
  there 
  would 
  be 
  little 
  or 
  no 
  danger 
  from 
  that 
  

   source, 
  besides 
  which 
  there 
  is 
  probal)ly 
  no 
  o.di})le 
  fish 
  that 
  is 
  not 
  

   more 
  or 
  less 
  afi'ected 
  with 
  some 
  kind 
  of 
  parasitic 
  worms. 
  

  

  However, 
  it 
  may 
  dispel 
  apprehension 
  to 
  state 
  that 
  similar 
  tape- 
  

   worms 
  in 
  some 
  places 
  are 
  actually 
  eaten 
  as 
  food 
  and 
  consi(hir(^d 
  

   delicacies. 
  In 
  Italy 
  a 
  parasite 
  of 
  the 
  European 
  tench 
  and 
  other 
  

   cyprinid 
  fishes 
  is 
  sold 
  in 
  the 
  markets 
  under 
  the 
  name 
  of 
  maccaroni 
  

   piatti 
  and 
  eaten, 
  usually 
  under 
  the 
  mistaken 
  notion 
  that 
  it 
  is 
  the 
  

   roe 
  of 
  the 
  fish. 
  The 
  same 
  or 
  a 
  similar 
  parasite 
  is 
  also 
  eaten 
  by 
  

   many 
  persons 
  in 
  Lyon 
  where 
  it 
  goes 
  by 
  the 
  appropriate 
  and 
  truthful 
  

   name 
  of 
  ver 
  hlanc 
  (white 
  worm). 
  It 
  is 
  stated 
  on 
  good 
  authority 
  

   that 
  in 
  this 
  country 
  a 
  choice 
  portion 
  of 
  another 
  iisii 
  not 
  infrequently 
  

   contains 
  encysted 
  parasitic 
  worms 
  which 
  the 
  consumer, 
  not 
  knowing 
  

   its 
  nature, 
  selects 
  as 
  a 
  delicate 
  morsel. 
  However, 
  since 
  these 
  facts 
  

   are 
  not 
  likely 
  to 
  completely 
  remove 
  a 
  deep-soattnl 
  })r(^ju(H(;e 
  or 
  lead 
  

   to 
  a 
  general 
  demand 
  for 
  tapeworms 
  on 
  the 
  menu 
  of 
  the 
  park 
  hotels, 
  

   it 
  would 
  l)e 
  (h^sirable 
  to 
  be 
  rid 
  of 
  these 
  parasites 
  or 
  even 
  to 
  reduce 
  

   the 
  number. 
  

  

  Several 
  methods, 
  moi-e 
  or 
  less 
  feasible, 
  have 
  ])een 
  suggested. 
  

   The 
  most 
  practical 
  and 
  at 
  the 
  same 
  time 
  the 
  most 
  desira})h> 
  of 
  these 
  

   is 
  the 
  introduction 
  of 
  other 
  iislies 
  into 
  Yellowstone 
  waters 
  to 
  detract 
  

   the 
  attention 
  of 
  the 
  native 
  trout 
  from 
  itself 
  as 
  a 
  food; 
  for 
  it 
  is 
  not 
  

   improbable 
  that 
  the 
  intensity 
  of 
  this 
  parasitic 
  infection 
  of 
  the 
  Yellow- 
  

   stone 
  Lake 
  trout 
  is 
  increased 
  by 
  cannibalism, 
  since 
  there 
  are 
  no 
  other 
  

   fishes 
  for 
  the 
  large 
  trout 
  to 
  eat. 
  Also, 
  these 
  additional 
  fishes 
  not 
  

   being 
  subject 
  to 
  infection 
  by 
  this 
  trout-pelican 
  parasite, 
  by 
  affording 
  

  

  