﻿54 
  

  

  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  assumes 
  its 
  functions 
  and 
  rouses 
  the 
  desire 
  for 
  food. 
  Until 
  this 
  time, 
  

   intent 
  only 
  on 
  hiding, 
  the 
  fry 
  have 
  clung 
  obstinately 
  to 
  the 
  bottom 
  and 
  

   to 
  the 
  dark 
  corners, 
  but 
  now 
  they 
  scatter 
  about 
  through 
  the 
  water, 
  

   with 
  lieads 
  upstream 
  watching 
  for 
  prey. 
  This 
  indicates 
  that 
  they 
  

   must 
  be 
  fed. 
  During 
  this 
  period 
  of 
  his 
  growth 
  it 
  is 
  simply 
  necessary 
  

   to 
  see 
  that 
  the 
  young 
  fish 
  has 
  plenty 
  of 
  water, 
  that 
  there 
  is 
  no 
  hole 
  or 
  

   crevice 
  into 
  which 
  he 
  can 
  be 
  drawn 
  by 
  the 
  current, 
  and 
  that 
  he 
  is 
  pro- 
  

   tected 
  from 
  enemies, 
  such 
  as 
  large 
  fishes, 
  minks, 
  rats, 
  kingfishers, 
  and 
  

   herons. 
  If 
  not 
  in 
  a 
  house, 
  well-fitting 
  covers 
  must 
  be 
  provided 
  to 
  the 
  

   troughs 
  and 
  impassable 
  screens 
  command 
  both 
  ends. 
  The 
  screens 
  are 
  

   of 
  fine 
  wire-cloth, 
  12 
  or 
  14 
  meshes 
  to 
  the 
  linear 
  inch, 
  and 
  present 
  a 
  sur- 
  

   face 
  of 
  14 
  square 
  inches 
  to 
  each 
  gallon 
  of 
  water 
  passing 
  through 
  them 
  

   each 
  minute. 
  Thus, 
  if 
  there 
  are 
  4 
  gallons 
  of 
  water 
  passing 
  through 
  the 
  

   trough 
  each 
  minute 
  the 
  portion 
  of 
  the 
  screen 
  beneath 
  the 
  surface 
  of 
  the 
  

   water 
  must 
  measure 
  as 
  much 
  as 
  56 
  square 
  inches, 
  and 
  if 
  the 
  screen 
  is 
  

   12 
  inches 
  wide 
  the 
  water 
  must 
  be 
  4f 
  inches 
  deep 
  on 
  the 
  screen. 
  

  

  Atlantic 
  Salmon, 
  leceuily 
  hatched. 
  

   REARING. 
  

  

  The 
  leading 
  feature 
  of 
  the 
  work 
  of 
  the 
  station 
  is 
  the 
  rearing 
  of 
  fry 
  to- 
  

   the 
  age 
  of 
  six 
  or 
  eight 
  months. 
  The 
  fishes 
  reared 
  are 
  mainly 
  Atlantic 
  

   salmon, 
  but 
  landlocked 
  salmon, 
  American 
  brook 
  trout, 
  European 
  brook 
  

   trout, 
  rainbow 
  trout, 
  steelhead 
  trout, 
  American 
  lake 
  trout, 
  Swiss 
  lake 
  

   trout, 
  Scotch 
  sea 
  trout, 
  and 
  saibling 
  have 
  also 
  been 
  handled. 
  The 
  fish 
  

   are 
  fed 
  Avholly 
  on 
  artificial 
  food 
  from 
  about 
  June 
  1 
  till 
  October 
  or 
  

   November, 
  when 
  they 
  are 
  mostly 
  liberated. 
  To 
  a 
  limited 
  extent 
  they 
  

   are 
  kept 
  in 
  artificial 
  ponds, 
  but 
  troughs 
  of 
  the 
  same 
  form 
  and 
  dimen- 
  

   sions 
  as 
  those 
  already 
  described 
  for 
  use 
  in 
  developing 
  the 
  eggs 
  and 
  in 
  

   hatching 
  have 
  given 
  satisfactory 
  results 
  and 
  have 
  been 
  adopted 
  for 
  the 
  

   most 
  part. 
  Each 
  trough 
  is 
  provided 
  with 
  a 
  changeable 
  outlet 
  screen 
  

   and 
  below 
  the 
  screen 
  discharges 
  the 
  water 
  through 
  a 
  hole 
  in 
  the 
  bottom, 
  

   into 
  wliich 
  is 
  fitted 
  a 
  hollow 
  plug, 
  the 
  height 
  of 
  which 
  determines 
  the 
  

   depth 
  of 
  water 
  in 
  the 
  trough. 
  The 
  hollow 
  plug 
  plays 
  an 
  important 
  part 
  

   in 
  the 
  daily 
  cleaning 
  of 
  the 
  trough, 
  which 
  will 
  be 
  referred 
  to 
  further 
  on. 
  

  

  The 
  use 
  of 
  the 
  troughs 
  in 
  the 
  open 
  air, 
  which, 
  in 
  the 
  absence 
  of 
  com- 
  

   modious 
  buildings, 
  is 
  a 
  necessity, 
  compels 
  the 
  constant 
  use 
  of 
  covers 
  -to 
  

   keep 
  out 
  vermin 
  ; 
  and 
  wooden 
  covers 
  in 
  pairs, 
  running 
  the 
  whole 
  length 
  

  

  