﻿112 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  For 
  the 
  first 
  few 
  weeks 
  after 
  the 
  eggs 
  have 
  reached 
  the 
  hatchery- 
  

   close 
  attention 
  must 
  be 
  given 
  to 
  prevent 
  the 
  growth 
  and 
  spread 
  of 
  

   fungus 
  throughout 
  the 
  tank. 
  The 
  eggs 
  must 
  be 
  carefully 
  hand-picked, 
  

   and 
  the 
  trays 
  and 
  boxes 
  kept 
  thoroughly 
  cleansed 
  from 
  slime 
  and 
  other 
  

   impurities. 
  If 
  a 
  heavy 
  rain 
  should 
  wash 
  dirt, 
  refuse, 
  etc., 
  into 
  the 
  

   supply 
  reservoir 
  and 
  thence 
  to 
  the 
  hatchery, 
  the 
  eggs 
  must 
  be 
  cleaned 
  

   to 
  prevent 
  their 
  smothering. 
  No 
  filter, 
  practical 
  for 
  use 
  in 
  a 
  hatchery, 
  

   has 
  been 
  invented 
  that 
  will 
  entirely 
  remove 
  injurious 
  substances. 
  

  

  To 
  remove 
  the 
  egg-trays 
  from 
  the 
  boxes 
  for 
  sorting, 
  the 
  binder 
  is 
  

   first 
  slipped 
  out 
  from 
  the 
  grooves 
  and 
  the 
  trays 
  taken 
  out 
  separately, 
  

   each 
  rising 
  to 
  the 
  surface 
  as 
  the 
  one 
  above 
  it 
  is 
  removed. 
  All 
  the 
  

   trays 
  are 
  taken 
  out 
  of 
  one 
  box 
  and 
  placed 
  one 
  after 
  another 
  along 
  

   the 
  picking-trough. 
  The 
  dead 
  eggs 
  and 
  "ringers" 
  — 
  the 
  latter 
  not 
  

   appearing 
  until 
  in 
  the 
  later 
  stages 
  of 
  incubation 
  — 
  are 
  then 
  picked 
  out 
  

   with 
  small 
  metal 
  tweezers. 
  The 
  eggs 
  will 
  turn 
  white 
  when 
  dead, 
  and 
  

   if 
  allowed 
  to 
  remain 
  upon 
  the 
  trays 
  a 
  fungus 
  will 
  soon 
  appear 
  upon 
  

   their 
  surface 
  and 
  spread 
  its 
  growth 
  until 
  all 
  the 
  eggs 
  within 
  a 
  short 
  

   radius 
  are 
  affected; 
  these 
  in 
  their 
  turn 
  will 
  be 
  smothered 
  and 
  become 
  

   fungussed 
  in 
  the 
  same 
  manner. 
  

  

  When 
  it 
  is 
  necessary 
  to 
  change 
  the 
  position 
  of 
  the 
  eggs 
  in 
  order 
  to 
  

   bring 
  those 
  at 
  the 
  bottom 
  to 
  the 
  surface 
  a 
  soft 
  feather 
  is 
  used, 
  and 
  if 
  

   manipulated 
  carefully 
  it 
  will 
  have 
  no 
  injurious 
  effect. 
  After 
  the 
  eggs 
  

   have 
  been 
  carefully 
  sorted 
  the 
  trays 
  are 
  again 
  placed 
  in 
  the 
  hatching- 
  

   box. 
  The 
  eggs 
  are 
  looked 
  over 
  at 
  least 
  every 
  three 
  days 
  during 
  the 
  

   first 
  five 
  or 
  six 
  weeks; 
  at 
  the 
  end 
  of 
  that 
  time, 
  in 
  a 
  water 
  temperature 
  

   of 
  from 
  40° 
  to 
  45° 
  F., 
  the 
  eye-spots 
  will 
  show 
  up 
  plainly, 
  and 
  from 
  this 
  

   stage 
  to 
  the 
  breaking 
  of 
  the 
  shell 
  less 
  labor 
  need 
  be 
  expended 
  in 
  this 
  

   direction, 
  for 
  the 
  eggs 
  are 
  not 
  so 
  susceptible 
  to 
  fungus, 
  etc., 
  as 
  in 
  the 
  

   early 
  stages. 
  At 
  this 
  period 
  unimpregnated 
  and 
  imperfectly 
  developed 
  

   eggs 
  are 
  easily 
  distinguished 
  and 
  taken 
  out 
  at 
  one 
  picking, 
  leaving 
  

   practically 
  only 
  those 
  that 
  will 
  ultimately 
  hatch 
  as 
  perfect 
  fry. 
  

  

  For 
  washing 
  the 
  eggs 
  when 
  coated 
  with 
  sediment 
  a 
  large 
  galvanized- 
  

   iron 
  pan, 
  about 
  2^ 
  feet 
  long. 
  If 
  feet 
  wide, 
  and 
  4 
  inches 
  deep, 
  is 
  used; 
  

   this 
  is 
  nearly 
  filled 
  with 
  water 
  and 
  a 
  tray 
  floated 
  on 
  its 
  surface. 
  The 
  

   eggs 
  are 
  gently 
  moved 
  about 
  with 
  a 
  feather, 
  and 
  by 
  submerging 
  and 
  

   quickly 
  raising 
  the 
  tray 
  the 
  eggs 
  will 
  be 
  left 
  as 
  clean 
  as 
  when 
  first 
  

   taken. 
  It 
  is 
  necessary 
  to 
  be 
  very 
  careful 
  to 
  give 
  no 
  sudden 
  jar 
  or 
  

   shock 
  to 
  the 
  eggs, 
  for 
  up 
  to 
  the 
  time 
  the 
  eye-spots 
  begin 
  to 
  appear 
  they 
  

   are 
  very 
  delicate 
  and 
  must 
  be 
  handled 
  accordingly. 
  It 
  is 
  better 
  to 
  

   allow 
  a 
  small 
  amount 
  of 
  dirt 
  to 
  remain 
  on 
  the 
  eggs 
  than 
  to 
  under- 
  

   take 
  washing 
  them, 
  which 
  should 
  only 
  be 
  done 
  when 
  the 
  coating 
  of 
  

   sediment 
  becomes 
  dangerously 
  heavy. 
  The 
  boxes 
  may 
  be 
  washed 
  when 
  

   the 
  trays 
  are 
  in 
  the 
  picking-trough, 
  but 
  to 
  wash 
  the 
  trays 
  is 
  difficult, 
  

   yet 
  very 
  necessary 
  in 
  case 
  they 
  become 
  covered 
  with 
  slime. 
  

  

  The 
  eggs 
  may 
  be 
  transferred 
  to 
  a 
  clean 
  tray 
  without 
  serious 
  harm 
  

   by 
  placing 
  the 
  clean 
  tray 
  face 
  downward 
  upon 
  the 
  dirty 
  one, 
  and 
  by 
  a 
  

   (piick 
  movement 
  reversing 
  their 
  positions, 
  submerging 
  both 
  trays 
  in 
  a 
  

  

  