﻿105 
  

  

  tlio 
  frcshl}' 
  spawned 
  ova. 
  It 
  is 
  olso 
  highly 
  probable 
  that 
  tlie 
  

   methods 
  of 
  manipulation 
  ma}'' 
  have 
  much 
  to 
  do 
  with 
  it. 
  

   Often 
  quite 
  a 
  time 
  elapses, 
  especially 
  when 
  following 
  the 
  gill 
  

   nets, 
  between 
  the 
  spawning 
  of 
  the 
  ova 
  and 
  the 
  shedding 
  of 
  

   the 
  milt 
  upon 
  them. 
  At 
  such 
  times 
  the 
  manipulation 
  must 
  

   almost 
  necessarily 
  be 
  imperfect. 
  It 
  is, 
  therefore, 
  very 
  ques- 
  

   tionable 
  whether 
  it 
  would 
  not 
  he 
  better 
  upon 
  the 
  wdiole 
  to 
  

   carry 
  all 
  ripe 
  fish 
  from 
  the 
  nets, 
  especially 
  the 
  gill-nets, 
  to 
  

   the 
  hatching 
  barges, 
  Isefore 
  spawning 
  or 
  milting. 
  This 
  

   might 
  involve 
  the 
  purchase 
  of 
  a 
  large 
  number 
  of 
  fish, 
  but 
  if 
  

   by 
  this 
  means 
  the 
  irreguhar 
  results, 
  which 
  so 
  often 
  follow 
  the 
  

   cartage 
  of 
  the 
  spawn, 
  could 
  be 
  avoided^ 
  and 
  the 
  number 
  of 
  

   young 
  fry 
  hatched 
  from 
  the 
  ova 
  be 
  relied 
  upon 
  as 
  being 
  from 
  

   ninety-five 
  to 
  ninety-eight 
  per 
  cent, 
  of 
  the 
  whole 
  amount 
  of 
  

   ova. 
  instead 
  of 
  as 
  now 
  varying 
  from 
  fifty 
  up 
  to 
  one 
  

   hundred 
  per 
  cent., 
  it 
  would 
  be 
  much 
  more 
  profitable. 
  Once 
  

   at 
  the 
  hatching-house, 
  the 
  spawn 
  could 
  be 
  taken 
  care 
  of 
  in 
  

   the 
  most 
  approved 
  manner, 
  and 
  records 
  kept, 
  which 
  would 
  

   enable 
  one 
  to 
  work 
  with 
  much 
  more 
  assurance 
  that 
  the 
  irrea- 
  

   ularities 
  would 
  be 
  eliminated. 
  It 
  has 
  been 
  by 
  the 
  patient 
  

   and 
  gradual 
  Avorking 
  out 
  of 
  those 
  things 
  unfavorable 
  to 
  the 
  

   development 
  of 
  Shad 
  ova, 
  that 
  Shad 
  hatching 
  owes 
  its 
  

   present 
  success. 
  It 
  took 
  a 
  longer 
  time 
  to 
  attain 
  comparative 
  

   success 
  with 
  the 
  Shad 
  than 
  with 
  the 
  Trout, 
  &c., 
  on 
  account 
  

   of 
  the 
  delicacy 
  and 
  lightness 
  of 
  the 
  Shad 
  ova 
  ; 
  and 
  if 
  the 
  

   Commission 
  can, 
  at 
  some 
  expense 
  and 
  a 
  little 
  pains, 
  do 
  away 
  

   with 
  the 
  irregularity 
  in 
  the 
  percentage 
  of 
  hatched 
  i'ry. 
  and 
  

   yet 
  hold 
  to 
  their 
  other 
  methods, 
  they 
  will 
  have 
  added 
  just 
  so 
  

   much 
  towards 
  the 
  literature 
  of 
  the 
  Shad 
  Hatchers' 
  Manual, 
  

   and 
  their 
  own 
  success 
  as 
  Shad 
  propagators. 
  

  

  The 
  remaining 
  subject 
  to 
  be 
  spoken 
  of 
  is 
  in 
  regard 
  to 
  the 
  

   temperature 
  of 
  the 
  water. 
  The 
  development 
  mentioned 
  in 
  this 
  

   paper 
  took 
  place 
  in 
  water 
  of 
  u 
  temperature 
  from 
  seventy-three 
  

   to 
  seventy-six 
  degrees. 
  In 
  water 
  of 
  such 
  a 
  temper- 
  

   ature 
  the 
  young 
  Shad 
  will, 
  a,s 
  already 
  mentioned, 
  hatch 
  out 
  

   during 
  the 
  third 
  day. 
  If 
  the 
  temperature 
  of 
  the 
  water 
  be 
  

  

  