﻿396 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FTSH 
  AND 
  FISHERIES. 
  [16] 
  

  

  of 
  the 
  successive 
  compartments 
  is 
  filled 
  to 
  the 
  water-level 
  with 
  cnltch, 
  

   preferably 
  oyster- 
  shells, 
  upon 
  which 
  the 
  spat 
  will 
  adhere. 
  Such 
  au 
  ap- 
  

   paratus, 
  containing 
  180 
  to 
  200 
  bushels 
  of 
  cultch, 
  would 
  be 
  as 
  efficient 
  

   as 
  the 
  same 
  amount 
  in 
  the 
  system 
  of 
  canals 
  in 
  connection 
  with 
  spawn- 
  

   ing 
  ponds, 
  with 
  on«ly 
  the 
  disadvantage 
  of 
  having 
  to 
  use 
  some 
  kind 
  of 
  

   power 
  in 
  order 
  to 
  pump 
  the 
  embryouized 
  water 
  through 
  it 
  instead 
  of 
  

   depending 
  upon 
  the 
  tides 
  to 
  operate 
  the 
  plant 
  automatically. 
  It 
  might 
  

   also 
  cost 
  relatively 
  somewhat 
  more 
  to 
  keep 
  in 
  repair 
  than 
  the 
  system 
  of 
  

   ponds 
  and 
  canals. 
  

  

  Taps 
  or 
  plugs 
  might 
  be 
  arranged 
  in 
  the 
  bottom 
  of 
  each 
  of 
  the 
  com- 
  

   partments 
  to 
  draw 
  off 
  any 
  accumulations 
  of 
  sediment 
  which 
  would 
  col- 
  

   lect 
  in 
  them. 
  

  

  Another 
  system 
  of 
  tanks 
  through 
  which 
  a 
  continuous 
  flow 
  of 
  embry- 
  

   ouized 
  water 
  might 
  be 
  kept 
  running 
  is 
  also 
  submitted 
  in 
  elevation 
  and 
  in 
  

   plan, 
  in 
  Plate 
  IV. 
  This 
  consists 
  of 
  a 
  series 
  of 
  ten 
  troughs, 
  a 
  to 
  7.-, 
  which, 
  

   as 
  in 
  the 
  preceding 
  system, 
  are 
  supported 
  on 
  a 
  framework 
  of 
  tressels. 
  

   The 
  embryouized 
  water, 
  from 
  the 
  spawning 
  ponds 
  or 
  vats, 
  is 
  pumped 
  

   into 
  the 
  highest 
  trough, 
  a, 
  and 
  runs 
  into 
  a 
  narrow 
  compartment 
  at 
  one 
  

   end 
  of 
  the 
  tank, 
  as 
  shown 
  in 
  section 
  in 
  the 
  sectional 
  elevation. 
  This 
  

   narrow 
  compartment 
  opens 
  below 
  into 
  a 
  space 
  covered 
  by 
  a 
  sloping 
  per- 
  

   forated 
  partition 
  or 
  bottom. 
  The 
  cultch 
  is 
  placed 
  in 
  the 
  trough 
  so 
  as 
  

   to 
  cover 
  the 
  perforated 
  false 
  bottom, 
  and 
  is 
  to 
  fill 
  the 
  trough 
  evenly 
  

   within 
  half 
  an 
  inch 
  of 
  the 
  water-level, 
  which 
  is 
  determined 
  by 
  the 
  height 
  

   of 
  the 
  board 
  at 
  the 
  other 
  or 
  outflow 
  end 
  of 
  the 
  trough 
  where 
  the 
  water 
  

   pours 
  over 
  a 
  chute 
  into 
  the 
  next 
  trough 
  below. 
  The 
  object 
  of 
  the 
  per- 
  

   forated 
  bottom 
  is 
  to 
  cause 
  the 
  embryos 
  to 
  be 
  distributed 
  and 
  be 
  brought 
  

   into 
  contact 
  with 
  the 
  under 
  side 
  of 
  the 
  shells 
  or 
  cultch. 
  After 
  the 
  water, 
  

   charged 
  with 
  free-swimming 
  embryos, 
  has 
  passed 
  through 
  this 
  chain 
  of 
  

   troughs 
  it 
  is 
  returned 
  to 
  the 
  spawning 
  pond 
  connected 
  with 
  a 
  canal 
  sys- 
  

   tem, 
  or 
  back 
  into 
  the 
  ponds 
  or 
  vats 
  in 
  which 
  artificially 
  fertilized 
  em- 
  

   bryos 
  have 
  been 
  poured. 
  

  

  Each 
  of 
  the 
  troughs 
  of 
  this 
  system 
  measures 
  12 
  feet 
  long, 
  G 
  to 
  8 
  feet 
  

   wide, 
  and 
  1 
  foot 
  deep. 
  It 
  is 
  undesirable 
  to 
  make 
  them 
  deeper 
  for 
  the 
  

   present, 
  as 
  it 
  is 
  doubtful 
  if 
  sufficient 
  light 
  would 
  penetrate 
  through 
  a 
  

   very 
  much 
  deeper 
  layer 
  of 
  cultch. 
  Their 
  aggregate 
  capacity 
  would 
  be 
  

   from 
  100 
  to 
  150 
  bushels 
  of 
  cultch, 
  or 
  very 
  much 
  less 
  than 
  could 
  be 
  ac- 
  

   commodated 
  in 
  the 
  system 
  of 
  canals. 
  v 
  I 
  believe, 
  however, 
  that 
  there 
  

   would 
  be 
  more 
  complete 
  control. 
  This 
  system 
  could 
  be 
  operated 
  with 
  

   great 
  expediency 
  at 
  Wood's 
  Holl, 
  where 
  the 
  experiments 
  of 
  this 
  year 
  

   have 
  very 
  conclusively 
  shown 
  that 
  oysters 
  will 
  live, 
  thrive, 
  and 
  increase, 
  

   some 
  individuals 
  from 
  Long 
  Island 
  Sound 
  having 
  made 
  a 
  new 
  growth 
  

   of 
  a 
  quarter 
  of 
  an 
  inch 
  in 
  the 
  short 
  space 
  of 
  a 
  month. 
  It 
  is 
  especialiy 
  

   desirable 
  to 
  conduct 
  the 
  work 
  of 
  spat-culture 
  at 
  Wood's 
  Holl, 
  in 
  the 
  

   lower 
  floors 
  of 
  the 
  new 
  laboratory 
  and 
  residence, 
  where 
  the 
  facilities 
  for 
  

   obtaining 
  an 
  abundance 
  of 
  sea-water 
  are 
  unsurpassed. 
  This 
  is 
  all 
  the 
  

   more 
  easily 
  done 
  now 
  that 
  our 
  experiments 
  in 
  transplanting 
  oysters 
  to 
  

  

  