﻿90 
  EEPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  The 
  Japanese 
  minister 
  to 
  the 
  United 
  States 
  very 
  courteously 
  

   acquainted 
  his 
  Government 
  in 
  advance 
  with 
  the 
  purposes 
  of 
  the 
  inves- 
  

   tigation, 
  and 
  the 
  Japanese 
  Government, 
  through 
  its 
  department 
  of 
  

   commerce 
  and 
  agriculture, 
  extended 
  every 
  facilit}^ 
  and 
  made 
  most 
  

   ample 
  provision 
  for 
  the 
  prosecution 
  of 
  the 
  inquiries, 
  detailing 
  differ- 
  

   ent 
  members 
  of 
  the 
  imperial 
  fisheries 
  bureau 
  to 
  accompany 
  the 
  

   Commission's 
  representative 
  on 
  his 
  travels 
  to 
  the 
  fishing 
  districts. 
  

   The 
  thanks 
  of 
  the 
  Commission 
  are 
  due 
  especially 
  to 
  Hon. 
  N. 
  Maki, 
  

   director 
  of 
  the 
  imperial 
  fisheries 
  bureau, 
  and 
  to 
  his 
  efficient 
  assist- 
  

   ants, 
  Doctors 
  Kishinouye, 
  Oku, 
  Kitahara, 
  Nishikawa, 
  and 
  Nishimura. 
  

   Many 
  courtesies 
  were 
  also 
  extended 
  by 
  officials 
  of 
  various 
  local 
  gov- 
  

   ernments, 
  as 
  well 
  as 
  by 
  private 
  citizens 
  in 
  all 
  places 
  visited. 
  

  

  At 
  the 
  request 
  of 
  the 
  Imperial 
  Fishery 
  Institute 
  in 
  Tokyo, 
  Doctor 
  

   Smith 
  delivered 
  an 
  illustrated 
  lecture 
  on 
  the 
  organization 
  and 
  work 
  

   of 
  the 
  United 
  States 
  Fish 
  Commission, 
  and, 
  at 
  the 
  solicitation 
  of 
  the 
  

   Imperial 
  Fisheries 
  Society, 
  he 
  gave 
  an 
  illustrated 
  lecture 
  in 
  Osaka 
  on 
  

   the 
  fishery 
  industries 
  of 
  the 
  United 
  States. 
  

  

  DISEASES 
  AND 
  PARASITES 
  OF 
  FISHES. 
  

   GENERAL 
  STUDY 
  OF 
  FISH 
  DISEASES. 
  

  

  Routine 
  consideration 
  of 
  the 
  diseases 
  affecting 
  domesticated 
  and 
  wild 
  

   fishes 
  has 
  been 
  given 
  by 
  Mr. 
  M. 
  C. 
  Marsh, 
  the 
  assistant 
  assigned 
  to 
  

   the 
  subject 
  of 
  fish 
  pathology; 
  and 
  numerous 
  investigations 
  have 
  been 
  

   made 
  in 
  the 
  interests 
  of 
  the 
  Commission, 
  various 
  States, 
  and 
  private 
  

   owners 
  of 
  fish 
  ponds 
  or 
  fish-cultural 
  establishments. 
  

  

  The 
  cause 
  of 
  the 
  destructive 
  epidemics 
  among 
  artificially 
  reared 
  

   brook 
  trout, 
  referred 
  to 
  in 
  previous 
  reports, 
  has 
  been 
  definitely 
  traced 
  

   to 
  a 
  germ, 
  of 
  which 
  a 
  full 
  account 
  has 
  been 
  published."' 
  This 
  organism 
  

   was 
  obtained 
  from 
  the 
  blood 
  of 
  diseased 
  brook 
  trout 
  and 
  stands 
  in 
  spe- 
  

   cific 
  causal 
  relation 
  to 
  the 
  disease. 
  It 
  is 
  a 
  pleomorphic 
  form, 
  which 
  

   appears 
  in 
  the 
  blood 
  and 
  local 
  lesions 
  of 
  its 
  host 
  as 
  longer 
  or 
  shorter 
  

   rods 
  with 
  occasional 
  spherical 
  forms. 
  It 
  is 
  pathogenic 
  particularly 
  to 
  

   the 
  brook 
  trout 
  {SalveUmisfontinalis)^ 
  but 
  has 
  been 
  isolated 
  from 
  Loch 
  

   Leven 
  trout 
  {SahiKO 
  trutta 
  levenensis) 
  in 
  epidemic, 
  and 
  in 
  a 
  few 
  cases 
  

   from 
  the 
  lake 
  trout 
  ( 
  Oristivomer 
  namaycush). 
  It 
  has 
  been 
  found 
  only 
  in 
  

   domesticated 
  or 
  aquarium 
  fish 
  and 
  never 
  in 
  wild 
  trout 
  from 
  natural 
  

   waters. 
  Healthy 
  brook 
  trout 
  succumb 
  to 
  the 
  disease 
  in 
  a 
  few 
  davs 
  

   by 
  direct 
  inoculation 
  beneath 
  the 
  skin 
  into 
  the 
  peritoneal 
  cavity 
  or 
  into 
  

   the 
  orbital 
  cavity, 
  and 
  after 
  a 
  longer 
  time 
  by 
  mixing 
  cultures 
  with 
  

   their 
  food; 
  the 
  organism 
  recoverable 
  in 
  all 
  cases 
  from 
  the 
  heart 
  blood. 
  

   Inoculation 
  into 
  the 
  dorsal 
  lymph 
  sac 
  of 
  a 
  frog 
  of 
  1 
  per 
  cent 
  of 
  its 
  

  

  a 
  Bacterium 
  Truttse, 
  anew 
  Species 
  of 
  Bacterium 
  Pattiogenic 
  to 
  Trout: 
  Science, 
  xvi, 
  706-707, 
  Octo- 
  

   ber 
  31, 
  1902. 
  A 
  More 
  Complete 
  Account 
  of 
  Bacterium 
  Truttse: 
  U. 
  S. 
  Fish 
  Commission 
  Bulletin, 
  1902, 
  

   pp. 
  411-415, 
  2 
  pi. 
  

  

  