﻿48 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  TRANSFER 
  OF 
  EG-GS 
  TO 
  THE 
  HATCHERY 
  AND 
  THEIR 
  CARE. 
  

  

  From 
  Dead 
  Brook 
  the 
  eggs 
  are 
  transferred 
  to 
  the 
  hatchery 
  at 
  Craig 
  

   Brook 
  station, 
  about 
  2 
  miles, 
  and 
  spread 
  on 
  trays 
  in 
  the 
  spawning- 
  

   house. 
  The 
  trays 
  are 
  placed 
  in 
  frames, 
  inclosed 
  in 
  boxes 
  which 
  are 
  

   padded 
  within 
  to 
  guard 
  against 
  concussion. 
  In 
  spite 
  of 
  all 
  precautions 
  

   some 
  of 
  the 
  eggs 
  are 
  occasionally 
  killed, 
  though 
  the 
  trays 
  are 
  placed 
  in 
  

   pans 
  of 
  water 
  and 
  the 
  eggs 
  poured 
  from 
  the 
  spawning-pans 
  with 
  the 
  

   greatest 
  care. 
  The 
  frames 
  or 
  " 
  stacks 
  " 
  containing 
  the 
  eggs 
  are 
  placed 
  

   at 
  once 
  in 
  the 
  troughs 
  where 
  they 
  are 
  to 
  be 
  developed. 
  

  

  The 
  trays 
  are 
  12^ 
  inches 
  square, 
  and 
  constructed 
  by 
  attaching 
  iron 
  

   wire-cloth 
  to 
  light 
  wooden 
  rims 
  with 
  blocks 
  at 
  tbe 
  corners, 
  so 
  that 
  when 
  

   piled 
  up, 
  one 
  above 
  another, 
  there 
  are 
  narrow 
  interstices 
  on 
  all 
  four 
  

   sides, 
  through 
  which 
  water 
  circulates 
  freely. 
  The 
  rims 
  of 
  the 
  trays 
  

   are 
  very 
  slender, 
  in 
  order 
  that 
  they 
  may 
  never 
  have 
  buoyancy 
  enough 
  

   to 
  float, 
  which 
  would 
  necessitate 
  some 
  means 
  of 
  holding 
  tliem 
  down 
  and 
  

   increase 
  the 
  trouble 
  attending 
  their 
  manipulation. 
  Southern 
  poplar 
  

   (whitewood) 
  is 
  commonly 
  used, 
  and 
  a 
  rim 
  ^ 
  inch 
  wide 
  and 
  | 
  inch 
  deep 
  

   answers 
  the 
  purpose 
  well, 
  provided 
  the 
  wire 
  be 
  not 
  very 
  light. 
  The 
  

   corner 
  pieces 
  are 
  ^ 
  inch 
  thick, 
  and 
  give 
  the 
  interstices 
  just 
  enough 
  

   width 
  to 
  xDrovide 
  an 
  ample 
  circulation 
  of 
  water, 
  but 
  not 
  enough 
  to 
  

   allow 
  the 
  escape 
  of 
  salmon 
  eggs, 
  which 
  are 
  nearly 
  ^ 
  inch 
  in 
  diameter. 
  

   Rusting 
  is 
  prevented 
  by 
  varnishing 
  the 
  wire-cloth 
  with 
  several 
  coats 
  of 
  

   asphaltum 
  varnish, 
  which 
  works 
  better 
  if 
  made 
  very 
  thin 
  by 
  the 
  use 
  of 
  

   a 
  large 
  proportion 
  of 
  spirits 
  of 
  turpentine. 
  The 
  same 
  varnish 
  gives 
  a 
  

   clean 
  and 
  glossy 
  surface 
  to 
  submerged 
  woodwork, 
  and 
  the 
  varnishing 
  

   is 
  extended 
  to 
  the 
  rims 
  of 
  the 
  trays, 
  the 
  < 
  'stack-pans,'' 
  and 
  the 
  interior 
  

   surfaces 
  of 
  the 
  troughs 
  themselves. 
  Material 
  subject 
  to 
  rust 
  should 
  be 
  

   used 
  only 
  with 
  great 
  caution. 
  Wire 
  or 
  other 
  metallic 
  forms 
  galvanized 
  

   with 
  zinc 
  vary 
  in 
  quality. 
  Total 
  loss 
  of 
  eggs 
  has 
  been 
  known 
  to 
  result 
  

   from 
  the 
  use 
  of 
  galvanized 
  wire-cloth 
  when 
  unvarnished. 
  Careful 
  

   experiment 
  should 
  precede 
  the 
  use 
  of 
  any 
  particular 
  brand. 
  Tinned 
  

   wire 
  cloth 
  is 
  better, 
  but 
  whether 
  enough 
  so 
  to 
  warrant 
  the 
  extra 
  

   expense 
  is 
  a 
  question. 
  

  

  In 
  developing 
  eggs, 
  in 
  order 
  to 
  economize 
  room, 
  the 
  trays 
  are 
  piled 
  

   uj) 
  10 
  or 
  20 
  deep 
  in 
  frames 
  that 
  contine 
  them 
  only 
  at 
  the 
  corners 
  and 
  do 
  

   not 
  hinder 
  the 
  free 
  passage 
  of 
  water 
  horizontally 
  through 
  the 
  '^ 
  stack." 
  

   About 
  2,000 
  Atlantic 
  salmon 
  eggs 
  are 
  placed 
  on 
  a 
  single 
  tray, 
  and 
  a 
  

   trough 
  of 
  the 
  ordinary 
  length, 
  lOi 
  feet, 
  therefore 
  carries 
  140,000 
  to 
  

   280,000 
  eggs, 
  with 
  suitable 
  free 
  space 
  at 
  either 
  end. 
  It 
  is 
  therefore 
  an 
  

   exceedingly 
  compact 
  apparatus 
  and 
  has 
  the 
  further 
  advantage 
  that 
  it 
  

   can 
  be 
  used 
  in 
  a 
  very 
  plain 
  trough 
  which 
  can, 
  with 
  a 
  few 
  minutes' 
  work, 
  

   be 
  transformed 
  into 
  a 
  rearing-trough 
  for 
  young 
  fish. 
  For 
  10-tray 
  stacks 
  

   the 
  trough 
  is 
  made 
  of 
  pine 
  boards, 
  12f 
  inches 
  wide 
  and 
  9 
  inches 
  deep 
  

   inside, 
  and 
  is 
  set 
  up 
  level, 
  with 
  the 
  top 
  about 
  30 
  inches 
  from 
  the 
  floor 
  of 
  

   the 
  room. 
  

  

  