﻿202 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  THE 
  jLPPARATUS 
  USED 
  IN 
  HATCHING 
  COD. 
  

  

  The 
  apparatus 
  and 
  metbods 
  employed 
  in 
  cod-culture 
  are 
  the 
  out- 
  

   growth 
  of 
  long 
  experience 
  and 
  study 
  and 
  have 
  as 
  their 
  special 
  features 
  

   the 
  closest 
  possible 
  simuhition 
  of 
  natural 
  conditions. 
  The 
  apparatus 
  

   now 
  in 
  general 
  use 
  is 
  the 
  so-called 
  McDonald 
  or 
  automatic 
  tidal 
  box. 
  

   The 
  boxes 
  are 
  constructed 
  in 
  series 
  of 
  12 
  or 
  less, 
  the 
  number 
  depend- 
  

  

  ...A. 
  

  

  DiaOTam 
  of 
  Tidal 
  Cod 
  Hatclunt^-Box. 
  

  

  a 
  FEET 
  

  

  A-B 
  Points 
  wliere 
  cross-section 
  is 
  taken. 
  

   o, 
  siphon. 
  

  

  c, 
  partitions 
  forming 
  iijiper 
  pockets. 
  

  

  d, 
  partition 
  forming 
  space 
  at 
  upper 
  end 
  of 
  

  

  compartment. 
  

  

  e, 
  partition 
  forming 
  space 
  at 
  lower 
  end 
  of 
  

  

  compartment. 
  

   /, 
  glass 
  gale. 
  

   g, 
  slot 
  between 
  adjoining 
  compartments. 
  

  

  ing 
  on 
  the 
  size 
  of 
  the 
  hatching-room, 
  the 
  arrangement 
  of 
  the 
  hatching- 
  

   tables, 
  or 
  other 
  conditions. 
  The 
  Gloucester 
  hatchery 
  has 
  8 
  tables 
  of 
  

   9 
  boxes 
  each, 
  and 
  Woods 
  Hole 
  14 
  tables 
  of 
  12 
  each. 
  At 
  Gloucester 
  

   25,000,000 
  eggs 
  can 
  be 
  hatched 
  at 
  one 
  time, 
  and 
  at 
  Woods 
  Hole 
  

   65,000,000. 
  For 
  a 
  wooden 
  framework 
  to 
  accommodate 
  9 
  boxes 
  such 
  

   as 
  are 
  used 
  ai 
  Glotucester 
  the 
  outside 
  dimensions 
  are: 
  Length, 
  10 
  

  

  