﻿MANUAL 
  OF 
  FISH-CULTURE. 
  97 
  

  

  inches 
  long 
  and 
  15| 
  inches 
  wide, 
  and 
  is 
  provided 
  with 
  a 
  waste-water 
  

   channel 
  or 
  shiiceway 
  leading- 
  into 
  the 
  next 
  compartment. 
  In 
  these 
  

   compartments 
  are 
  placed 
  the 
  hatching 
  boxes 
  proper. 
  

  

  The 
  Clark 
  box 
  is 
  18 
  inches 
  long, 
  14 
  inches 
  wide, 
  and 
  9.} 
  inches 
  deep, 
  

   and 
  is 
  made 
  from 
  f 
  -inch 
  dressed 
  whitewood 
  Inmber. 
  On 
  its 
  under 
  side 
  

   the 
  box 
  is 
  provided 
  with 
  feet, 
  li 
  inches 
  square 
  and 
  =J 
  inch 
  thick, 
  to 
  allow 
  

   a 
  free 
  circulation 
  of 
  water 
  under 
  it 
  and 
  to 
  prevent 
  it 
  from 
  resting 
  npou 
  

   anj- 
  sediment 
  or 
  refuse 
  that 
  may 
  be 
  deposited 
  on 
  the 
  bottom 
  of 
  the 
  

   tank; 
  and 
  on 
  the 
  inside 
  in 
  each 
  bottom 
  corner 
  is 
  fastened 
  a 
  block, 
  g 
  inch 
  

   thick 
  by 
  1 
  J 
  inches 
  square, 
  to 
  support 
  the 
  trays. 
  Five 
  circular 
  openings, 
  

   J 
  inch 
  in 
  diameter, 
  permit 
  the 
  -escape 
  of 
  water 
  from 
  the 
  box. 
  A 
  slot 
  is 
  

   cut 
  in 
  one 
  end 
  of 
  the 
  box 
  so 
  that 
  water 
  from 
  the 
  compartment 
  above 
  

   can 
  not 
  flow 
  into 
  the 
  one 
  below 
  without 
  falling 
  into 
  and 
  passing 
  through 
  

   this 
  box. 
  Upon 
  the 
  feet 
  or 
  risers 
  inside 
  the 
  box 
  rest 
  9 
  trays, 
  made 
  of 
  

   lierforated 
  zinc 
  or 
  fine 
  wire 
  netting, 
  tacked 
  upon 
  a 
  frame 
  10 
  inches 
  long 
  

   and 
  12 
  inches 
  wide. 
  This 
  frame 
  is 
  made 
  from 
  finch 
  pine, 
  I4 
  inches 
  

   wide. 
  The 
  trays 
  are 
  placed 
  one 
  upon 
  the 
  other 
  in 
  the 
  box, 
  the 
  end 
  

   which 
  contains 
  the 
  slot 
  fitting 
  snugly 
  against 
  the 
  upper 
  end 
  of 
  the 
  com- 
  

   partment, 
  in 
  which 
  is 
  fitted 
  a 
  tin 
  overflow. 
  The 
  whole 
  is 
  held 
  in 
  place 
  

   by 
  a 
  crossbar 
  or 
  binder, 
  which 
  fits 
  in 
  finch 
  grooves 
  cut 
  in 
  both 
  sides 
  

   of 
  the 
  tank. 
  The 
  binder, 
  resting 
  upon 
  the 
  box, 
  keeps 
  it 
  from 
  rising 
  in 
  

   the 
  water, 
  and 
  is 
  provided 
  with 
  feet 
  so 
  placed 
  as 
  to 
  prevent 
  the 
  trays 
  

   from 
  floating 
  in 
  the 
  box 
  itself. 
  

  

  Uj)on 
  the 
  arrival 
  of 
  the 
  green 
  eggs 
  at 
  the 
  hatchery 
  they 
  are 
  trans- 
  

   ferred 
  from 
  the 
  flannel 
  trays 
  to 
  a 
  large 
  galvanized 
  iron 
  pan, 
  and 
  

   thence 
  to 
  the 
  Clark 
  hatching-boxes. 
  The 
  eggs 
  are 
  measured 
  with 
  a 
  

   glass 
  graduate 
  and 
  5,000 
  placed 
  upon 
  each 
  tray, 
  the 
  ninth 
  or 
  top 
  tray 
  

   being 
  used 
  only 
  as 
  a 
  cover. 
  The 
  eggs 
  from 
  domesticated 
  brook 
  trout 
  

   measure 
  350 
  to 
  450 
  per 
  fluid 
  ounce, 
  depending 
  on 
  the 
  age 
  of 
  the 
  fish. 
  

   Eggs 
  from 
  wild 
  trout 
  collected 
  in 
  the 
  Au 
  Sable 
  River 
  measure 
  450 
  to 
  

   the 
  fluid 
  ounce. 
  

  

  CARE 
  OF 
  THE 
  EGGS. 
  

  

  At 
  intervals 
  of 
  from 
  three 
  to 
  six 
  days 
  during 
  the 
  period 
  of 
  incuba- 
  

   tion, 
  in 
  order 
  to 
  remove 
  the 
  bad 
  eggs, 
  the 
  trays 
  are 
  taken 
  from 
  the 
  

   boxes 
  and 
  placed 
  in 
  a 
  shallow 
  picking-trough 
  through 
  which 
  a 
  stream 
  

   of 
  not 
  more 
  than 
  3 
  gallons 
  per 
  minute 
  is 
  flowing. 
  This 
  trough 
  is 
  only 
  

   wide 
  enough 
  to 
  allow 
  perfect 
  freedom 
  in 
  handling 
  the 
  trays 
  when 
  put- 
  

   ting 
  them 
  into 
  or 
  removing 
  them 
  from 
  it, 
  and 
  only 
  of 
  suflQcient 
  depth 
  

   to 
  allow 
  the 
  eggs 
  to 
  be 
  fairly 
  covered. 
  Nailed 
  to 
  the 
  bottom 
  on 
  each 
  

   side 
  is 
  a 
  ^-inch 
  strip, 
  li 
  inches 
  wide, 
  and 
  running 
  the 
  entire 
  length 
  of 
  

   the 
  trough. 
  These 
  strii)s 
  permit 
  the 
  free 
  passage 
  of 
  water 
  beneath 
  

   the 
  trays, 
  as 
  otherwise 
  the 
  water 
  would 
  flow 
  over 
  the 
  tops 
  and 
  a 
  great 
  

   many 
  eggs 
  would 
  be 
  lost. 
  The 
  bad 
  eggs 
  are 
  removed 
  with 
  a 
  pair 
  of 
  

   tweezers, 
  the 
  labor 
  of 
  sorting 
  being 
  usually 
  performed 
  by 
  girls, 
  who 
  in 
  

   time 
  become 
  so 
  expert 
  that 
  one 
  girl 
  will 
  often 
  remove 
  100 
  bad 
  eggs 
  per 
  

   minute. 
  

  

  F. 
  C. 
  R. 
  1897 
  7 
  

  

  