﻿MANUAL 
  OF 
  FISH-CULTURE. 
  123 
  

  

  three 
  minutes, 
  the 
  water 
  is 
  poured 
  off 
  and 
  fresh 
  water 
  added, 
  and 
  this 
  

   is 
  repeated 
  until 
  the 
  water 
  comes 
  away 
  clear, 
  when 
  the 
  eggs 
  are 
  poured 
  

   into 
  the 
  keg 
  or 
  can 
  previously 
  filled 
  with 
  water, 
  and 
  the 
  work 
  of 
  taking 
  

   spawn 
  is 
  continued. 
  Before 
  adding 
  another 
  lot 
  those 
  previously 
  put 
  into 
  

   the 
  keg 
  are 
  gently 
  stirred. 
  It 
  is 
  necessary 
  to 
  change 
  the 
  water 
  on 
  the 
  

   eggs 
  at 
  least 
  once 
  an 
  hour, 
  and 
  oftener 
  if 
  the 
  weather 
  is 
  warm, 
  and 
  the 
  

   eggs 
  should 
  be 
  gently 
  stirred 
  to 
  the 
  bottom 
  of 
  the 
  keg 
  every 
  30 
  minutes 
  

   until 
  they 
  are 
  placed 
  in 
  running 
  water 
  in 
  the 
  hatchery. 
  

  

  When 
  the 
  spawn-taker 
  has 
  finished 
  he 
  turns 
  over 
  the 
  eggs 
  to 
  a 
  man 
  

   in 
  charge 
  of 
  the 
  field 
  work, 
  who 
  cares 
  for 
  them 
  until 
  the 
  collecting 
  

   steamer 
  comes, 
  when 
  they 
  are 
  taken 
  aboard 
  and 
  transported 
  to 
  the 
  sta- 
  

   tion, 
  some 
  2 
  to 
  5 
  hours 
  having 
  elapsed 
  since 
  they 
  were 
  taken. 
  At 
  the 
  

   station 
  the 
  eggs 
  are 
  kept 
  in 
  the 
  kegs 
  in 
  which 
  they 
  were 
  placed 
  by 
  the 
  

   spawn-taker 
  and 
  a 
  stream 
  of 
  water 
  of 
  about 
  13 
  gallons 
  per 
  minute 
  to 
  

   each 
  keg 
  is 
  kept 
  running 
  on 
  them 
  until 
  the 
  next 
  morning, 
  and 
  they 
  are 
  

   stirred 
  to 
  the 
  very 
  bottom 
  once 
  an 
  hour 
  in 
  the 
  meantime. 
  In 
  this 
  way 
  

   the 
  eggs 
  are 
  given 
  time 
  to 
  harden 
  with 
  less 
  injury 
  than 
  if 
  they 
  were 
  

   immediately 
  placed 
  in 
  the 
  jars. 
  

  

  Formerly 
  in 
  shipping 
  eggs 
  long 
  distances 
  they 
  were 
  kept 
  in 
  running 
  

   water 
  in 
  kegs, 
  under 
  the 
  care 
  of 
  a 
  watchman, 
  but 
  it 
  has 
  been 
  found 
  

   much 
  better 
  to 
  ship 
  them 
  in 
  cases 
  on 
  trays. 
  After 
  having 
  been 
  in 
  water 
  

   8 
  or 
  10 
  hours, 
  whitefish 
  ova 
  may 
  be 
  safely 
  placed 
  two 
  or 
  three 
  layers 
  

   deep 
  on 
  trays 
  and 
  shipped 
  indefinite 
  distances. 
  If 
  the 
  weather 
  is 
  warm 
  

   (55° 
  or 
  60° 
  F.) 
  the 
  cases 
  must 
  be 
  surrounded 
  with 
  ice, 
  or 
  sawdust 
  and 
  ice. 
  

  

  In 
  placing 
  the 
  eggs 
  on 
  the 
  trays 
  a 
  perforated 
  dipper 
  is 
  used 
  and 
  a 
  

   little 
  practice 
  soon 
  shows 
  about 
  how 
  many 
  to 
  dip 
  out 
  for 
  each 
  tray, 
  and 
  

   if 
  just 
  enough 
  water 
  is 
  left 
  with 
  the 
  eggs 
  a 
  slight 
  tilting 
  of 
  the 
  tray 
  

   will 
  distribute 
  them 
  evenly 
  over 
  its 
  surface. 
  Then 
  by 
  setting 
  the 
  tray 
  

   with 
  one 
  corner 
  on 
  the 
  floor 
  and 
  the 
  diagonally 
  oi)posite 
  corner 
  raised 
  

   3 
  or 
  4 
  inches, 
  the 
  surplus 
  water 
  will 
  soon 
  dram 
  ott". 
  This 
  may 
  be 
  facili- 
  

   tated 
  by 
  slipping 
  a 
  thin 
  wooden 
  wedge 
  between 
  the 
  cloth 
  and 
  wood 
  at 
  

   the 
  lower 
  corner 
  of 
  the 
  tray. 
  

  

  In 
  shipping 
  a 
  distance 
  of 
  40 
  or 
  50 
  miles, 
  the 
  trays 
  may 
  be 
  placed 
  in 
  

   the 
  cases 
  with 
  no 
  other 
  protection 
  from 
  change 
  of 
  temperature 
  than 
  

   the 
  wood 
  of 
  which 
  they 
  are 
  constructed 
  — 
  an 
  inch 
  thickness 
  of 
  tray 
  and 
  

   an 
  inch 
  of 
  case 
  with 
  an 
  inch 
  of 
  air-space 
  between 
  — 
  which 
  is 
  found 
  to 
  

   be 
  safe 
  in 
  a 
  cool 
  car 
  or 
  room 
  in 
  a 
  boat, 
  but 
  for 
  longer 
  distances 
  about 
  

   20 
  trays 
  are 
  fastened 
  together 
  with 
  thin 
  strips 
  of 
  wood 
  tacked 
  to 
  either 
  

   side 
  and 
  placed 
  in 
  a 
  large 
  case 
  with 
  from 
  4 
  to 
  G 
  inches 
  of 
  pine 
  sawdust 
  

   well 
  packed 
  on 
  every 
  side. 
  

  

  After 
  the 
  eggs 
  are 
  placed 
  on 
  trays 
  and 
  drained, 
  they 
  are 
  covered 
  

   with 
  a 
  thickness 
  of 
  mosquito 
  iiettmg, 
  well 
  washed 
  and 
  lelt 
  damp, 
  and 
  

   over 
  this 
  is 
  packed 
  enough 
  damp 
  moss 
  to 
  fill 
  the 
  tray 
  even 
  with 
  the 
  

   surface. 
  If 
  eggs 
  are 
  to 
  go 
  by 
  express, 
  unaccompanied 
  by 
  a 
  messenger, 
  

   directions 
  are 
  fastened 
  to 
  the 
  case 
  stating 
  that 
  they 
  must 
  be 
  kept 
  cool 
  

   but 
  not 
  permitted 
  to 
  freeze. 
  Whitefish 
  eggs 
  have 
  been 
  safely 
  shipped 
  

   in 
  this 
  way 
  from 
  Northvilie, 
  Michigan, 
  to 
  Australia. 
  If 
  the 
  eggs 
  are 
  

  

  