﻿FISHES 
  OF 
  THE 
  YELLOWSTONE 
  NATIONAL 
  PARK. 
  7 
  

  

  Twin 
  Lalces. 
  — 
  Whitefish 
  were 
  planted 
  in 
  1899, 
  but 
  have 
  never 
  been 
  

   heard 
  of 
  smce. 
  

  

  Beaver 
  LaTce 
  (connects 
  with 
  Obsidian 
  Creelc). 
  — 
  Eastern 
  brook 
  trout 
  

   are 
  plentiful 
  in 
  the 
  lake, 
  but 
  the 
  rainbow 
  trout 
  also 
  planted 
  there 
  have 
  

   never 
  been 
  heard 
  of. 
  

  

  De 
  Lacy 
  Lalce. 
  — 
  The 
  rainbow 
  trout 
  planted 
  in 
  1895 
  have 
  not 
  been 
  

   observed. 
  

  

  Ice 
  Lalce 
  (near 
  Gardiner 
  River). 
  — 
  Eastern 
  brook 
  trout 
  planted 
  here 
  

   have 
  never 
  been 
  reported. 
  

  

  Ice 
  Lalce 
  (between 
  Fountain 
  and 
  Excelsior 
  Geysers). 
  — 
  Blackspotted 
  

   trout 
  planted 
  in 
  1905 
  have 
  not 
  been 
  heard 
  of. 
  

  

  Upper 
  Basin 
  Lalces 
  (in 
  Firelwle 
  Basin). 
  — 
  Black 
  bass 
  planted 
  m 
  1895 
  

   never 
  have 
  been 
  observed. 
  

  

  FLSniNG 
  RULES 
  AND 
  REGULATIONS. 
  

  

  The 
  following 
  rules 
  and 
  regulations 
  applicable 
  to 
  fishing 
  in 
  the 
  park 
  

   have 
  been 
  prescribed 
  by 
  the 
  superintendent: 
  

  

  Fishing 
  with 
  nets, 
  seines, 
  traps, 
  or 
  by 
  the 
  use 
  of 
  drugs 
  or 
  explosives, 
  or 
  in 
  any 
  other 
  

   way 
  than 
  with 
  hook 
  and 
  line, 
  is 
  prohibited. 
  Fishing 
  for 
  purposes 
  of 
  merchandise 
  or 
  

   profit 
  is 
  forbidden. 
  Fishing 
  may 
  be 
  prohibited 
  by 
  order 
  of 
  the 
  superintendent 
  of 
  the 
  

   park 
  in 
  any 
  of 
  the 
  waters 
  of 
  the 
  park, 
  or 
  limited 
  therein 
  to 
  any 
  specified 
  season 
  of 
  the 
  

   year, 
  until 
  otherwise 
  ordered 
  by 
  the 
  Secretary 
  of 
  the 
  Interior. 
  

  

  All 
  fish 
  less 
  than 
  8 
  inches 
  in 
  length 
  should 
  at 
  once 
  be 
  retiu-ned 
  to 
  the 
  water 
  with 
  

   the 
  least 
  damage 
  possible 
  to 
  the 
  fish. 
  Fish 
  that 
  are 
  to 
  be 
  retained 
  must 
  be 
  at 
  once 
  

   killed 
  by 
  a 
  blow 
  on 
  the 
  back 
  of 
  the 
  head 
  or 
  by 
  thrusting 
  a 
  knife 
  or 
  other 
  sharp 
  instru- 
  

   ment 
  into 
  the 
  head. 
  No 
  person 
  shall 
  catch 
  more 
  than 
  20 
  fish 
  in 
  one 
  day. 
  

  

  PARASITES 
  OF 
  THE 
  TROUT. 
  

  

  It 
  has 
  long 
  been 
  known 
  that 
  in 
  certain 
  waters 
  of 
  the 
  Yellowstone 
  

   Park 
  trout 
  are 
  infested 
  with 
  parasitic 
  worms, 
  while 
  in 
  other 
  park 
  

   waters 
  they 
  were 
  free 
  from 
  this 
  parasite. 
  Yellowstone 
  Lake 
  fish 
  

   appear 
  to 
  be 
  the 
  most 
  seriously 
  affected, 
  and 
  the 
  fact 
  of 
  this 
  para- 
  

   sitism 
  has 
  been 
  of 
  no 
  little 
  concern 
  to 
  anglers, 
  consumers 
  of 
  fish, 
  

   and 
  fish 
  culturists 
  in 
  that 
  region. 
  

  

  This 
  parasite 
  is 
  a 
  tapeworm, 
  to 
  which 
  the 
  late 
  Prof. 
  Joseph 
  Leidy, 
  

   who 
  first 
  described 
  the 
  species, 
  gave 
  the 
  name 
  of 
  DihotJirium 
  cordiceps. 
  

   In 
  the 
  larval 
  stage 
  this 
  worm 
  occm's 
  in 
  cysts 
  among 
  or 
  on 
  the 
  viscera 
  

   of 
  the 
  trout, 
  free 
  among 
  the 
  viscera, 
  beneath 
  the 
  peritoneal 
  lining 
  

   of 
  the 
  abdominal 
  cavity, 
  or 
  in 
  the 
  muscular 
  tissue.'* 
  

  

  It 
  is 
  only 
  the 
  larval 
  or 
  intermediate 
  stage 
  that 
  occurs 
  in 
  the 
  trout, 
  

   the 
  host 
  of 
  the 
  adult 
  appearing 
  to 
  be 
  an 
  entu-ely 
  different 
  animal, 
  

   as 
  is 
  the 
  case 
  with 
  aU 
  tapeworms. 
  Briefly, 
  its 
  life 
  cycle 
  seems 
  to 
  be 
  as 
  

   foUows 
  : 
  Starting 
  with 
  the 
  egg 
  in 
  the 
  water, 
  it 
  develops 
  into 
  a 
  ciliated 
  

  

  a. 
  A 
  full 
  discussion 
  of 
  this 
  subject 
  will 
  be 
  found 
  in 
  the 
  following 
  paper: 
  A 
  contribution 
  to 
  the 
  life 
  history 
  

   of 
  Dibothrium 
  cordiceps 
  Leidy, 
  a 
  parasite 
  infesting 
  the 
  trout 
  of 
  "Yellowstone 
  Lake. 
  By 
  Edwin 
  Linton. 
  

   Bulletin 
  U. 
  S. 
  Fish 
  Commission, 
  vol. 
  ix, 
  for 
  1899, 
  p. 
  337-338, 
  with 
  plates. 
  

  

  