﻿324 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  over 
  the 
  platform, 
  and 
  give 
  tlie 
  fry 
  a 
  better 
  chance 
  to 
  escape 
  without 
  immediately 
  

   sinking 
  into 
  the 
  oo/e 
  below. 
  

  

  The 
  mean 
  depth 
  of 
  water 
  in 
  the 
  pond 
  and 
  canals 
  ought 
  not 
  to 
  be 
  less 
  than 
  Si 
  feet 
  

   and 
  the 
  bottom 
  of 
  the 
  pond 
  and 
  canals 
  should 
  be 
  cut 
  to 
  the 
  same 
  level, 
  with 
  a 
  view 
  

   to 
  get 
  the 
  full 
  benefit 
  of 
  the 
  tides. 
  

  

  The 
  method 
  of 
  operating 
  such 
  a 
  system 
  will 
  now 
  be 
  explained. 
  The 
  pond, 
  X, 
  is 
  

   supplied 
  with 
  the 
  above 
  specified 
  quantity 
  of 
  good 
  spawning 
  oysters, 
  which 
  at 
  a 
  low 
  

   estimate 
  ought, 
  at 
  the 
  rate 
  of 
  50 
  females 
  per 
  bushel, 
  to 
  yield 
  from 
  100,000,000,000 
  to 
  

   200,000,000,000 
  of 
  fry 
  during 
  the 
  time 
  the 
  cultch 
  may 
  be 
  in 
  position 
  in 
  the 
  canals. 
  

   If, 
  however, 
  the 
  oysters 
  were 
  very 
  large 
  selected 
  ones, 
  fully 
  twice 
  as 
  much 
  fry 
  ought 
  

   to 
  be 
  thrown 
  out 
  by 
  them, 
  or 
  fully 
  200,000,000,000 
  to 
  400,000,000,000. 
  

  

  This 
  enormous 
  quantity 
  of 
  embryos 
  must, 
  unless 
  it 
  finds 
  some 
  objects 
  to 
  which 
  to 
  

   attach 
  itself, 
  be 
  irrevocably 
  lost. 
  In 
  order, 
  therefore, 
  to 
  provide 
  it 
  with 
  a 
  nidus 
  for 
  

  

  ,^J^^ 
  

  

  Cut 
  6. 
  — 
  Receptacle 
  for 
  cultch. 
  

  

  the 
  purpose 
  of 
  fixation, 
  an 
  extensive 
  system 
  of 
  collectors 
  is 
  proA'ided 
  in 
  the 
  chan- 
  

   nel, 
  s. 
  These 
  are 
  figured 
  in 
  detail 
  above, 
  the 
  first 
  being 
  an 
  end 
  and 
  the 
  second 
  a 
  

   side 
  view 
  and 
  the 
  third 
  a 
  plan. 
  These 
  are 
  essentially 
  flat 
  baskets, 
  with 
  wooden 
  

   ends, 
  and 
  with 
  the 
  bottoms 
  and 
  sides 
  formed 
  of 
  a 
  very 
  coarse 
  kind 
  of 
  galvanized 
  

   iron 
  wire 
  netting 
  with 
  1 
  to 
  li 
  inch 
  mesh. 
  At 
  the 
  top 
  they 
  are 
  open, 
  and 
  on 
  either 
  

   side 
  a 
  strong 
  strip 
  or 
  scantling 
  is 
  secured 
  and 
  projects 
  ovit 
  past 
  the 
  ends 
  of 
  the 
  box 
  

   or 
  receptacle, 
  to 
  atford 
  a 
  means 
  of 
  supporting 
  the 
  whole 
  upon 
  scantling 
  or 
  ledges 
  

   secured 
  near 
  the 
  tops 
  of 
  the 
  sides 
  of 
  the 
  canals, 
  s. 
  These 
  projections 
  of 
  the 
  strips 
  

   are 
  also 
  intended 
  to 
  afford 
  handles 
  by 
  which 
  two 
  men 
  may 
  lift 
  and 
  move 
  the 
  

   apparatus 
  about. 
  The 
  uprights 
  at 
  the 
  ends 
  and 
  the 
  horizontal 
  crossbars 
  are 
  intended 
  

   to 
  enable 
  the 
  culturist 
  to 
  vibrate 
  the 
  box 
  and 
  its 
  contents 
  in 
  the 
  water 
  of 
  the 
  

   canal 
  without 
  lifting 
  it 
  out, 
  and 
  in 
  such 
  a 
  way 
  as 
  to 
  wash 
  off 
  any 
  injurious 
  accu-_ 
  

   mulatiou 
  of 
  sediment 
  not 
  swept 
  away 
  by 
  the 
  action 
  of 
  the 
  jetties 
  presently 
  to 
  be 
  

   described. 
  

  

  