﻿MANUAL 
  OF 
  FISH-CULTURE. 
  19 
  

  

  The 
  egg 
  receptacles 
  are 
  deep 
  wire 
  trays 
  or 
  baskets 
  about 
  12 
  inches 
  

   wide, 
  24 
  inches 
  long, 
  and 
  deep 
  enough 
  to 
  project 
  an 
  inch 
  or 
  two 
  above 
  

   the 
  water, 
  which 
  is 
  5 
  or 
  6 
  inches 
  deep 
  in 
  the 
  troughs 
  in 
  which 
  they 
  are 
  

   placed. 
  Into 
  each 
  of 
  these 
  baskets 
  2 
  gallons 
  of 
  salmon 
  eggs, 
  equiva- 
  

   lent 
  to 
  about 
  30,000, 
  are 
  poured 
  at 
  a 
  time. 
  The 
  eggs 
  suffer 
  no 
  injury 
  

   whatever 
  from 
  being 
  packed 
  together 
  in 
  this 
  manner, 
  the 
  water 
  being 
  

   supplied 
  in 
  a 
  way 
  that 
  forces 
  it 
  through 
  the 
  eggs, 
  partially 
  supporting 
  

   and 
  circulating 
  through 
  them. 
  The 
  meshes 
  are 
  too 
  small 
  to 
  permit 
  the 
  

   eggs 
  to 
  pass 
  through, 
  although 
  the 
  fry 
  are 
  able 
  to 
  do 
  so. 
  

  

  The 
  advantages 
  of 
  this 
  apparatus 
  and 
  method 
  are: 
  

  

  (1) 
  The 
  top 
  of 
  the 
  tray 
  or 
  basket 
  is 
  out 
  of 
  the 
  water 
  and 
  always 
  

   entirely 
  dry; 
  consequently, 
  in 
  handling 
  it, 
  the 
  hands 
  are 
  kept 
  dry. 
  

  

  (2) 
  By 
  tilting 
  one 
  end 
  of 
  the 
  tray 
  up 
  and 
  down 
  a 
  little 
  or 
  by 
  lifting 
  

   it 
  entirely 
  and 
  settling 
  it 
  gently 
  back 
  again 
  in 
  its 
  place 
  the 
  bad 
  eggs 
  

   will 
  be 
  forced 
  to 
  the 
  top; 
  thus 
  a 
  feather 
  is 
  not 
  required 
  in 
  pickiug 
  over 
  

   the 
  eggs 
  and 
  the 
  injuries 
  very 
  often 
  inflicted 
  with 
  it 
  are 
  avoided. 
  

  

  (3) 
  The 
  top 
  of 
  the 
  tray 
  being 
  above 
  water, 
  the 
  eggs 
  can 
  never 
  run 
  

   over 
  the 
  top 
  nor 
  escape 
  in 
  any 
  way, 
  whicb 
  is 
  a 
  great 
  advantage 
  over 
  

   the 
  shallow 
  form 
  of 
  tray. 
  

  

  (4) 
  There 
  is 
  economy 
  of 
  space; 
  30,000 
  to 
  40,000 
  eggs 
  can 
  be 
  placed 
  

   in 
  each 
  basket, 
  provided 
  a 
  sufiQcient 
  quantity 
  of 
  water 
  is 
  available. 
  

   Two 
  troughs, 
  16 
  feet 
  long 
  and 
  1 
  foot 
  wide, 
  will 
  by 
  this 
  method 
  carry 
  

   about 
  500,000 
  salmon 
  eggs. 
  The 
  deep 
  trays 
  may 
  be 
  filled 
  at 
  least 
  half 
  

   full 
  of 
  eggs, 
  and 
  thus 
  ten 
  times 
  as 
  many 
  eggs 
  can 
  be 
  hatched 
  in 
  the 
  

   same 
  space 
  and 
  with 
  the 
  same 
  supply 
  of 
  water 
  as 
  by 
  the 
  old 
  method. 
  

   A 
  good 
  but 
  gentle 
  circulation 
  is 
  continually 
  maintained 
  through 
  the 
  

   eggs. 
  

  

  (5) 
  The 
  deep-tray 
  system 
  is 
  admirably 
  adapted 
  to 
  getting 
  rid 
  of 
  mud 
  

   that 
  has 
  collected 
  on 
  the 
  eggs, 
  for 
  all 
  sediment 
  accumulating 
  about 
  

   them 
  can 
  be 
  easily 
  removed 
  by 
  gently 
  moving 
  the 
  tray 
  up 
  and 
  down 
  a 
  

   few 
  times 
  in 
  the 
  water 
  j 
  but 
  if 
  the 
  deposit 
  of 
  mud 
  on 
  the 
  troughs 
  

   becomes 
  so 
  excessive 
  as 
  to 
  be 
  nnmanageable, 
  a 
  false 
  bottom 
  of 
  wire 
  

   cloth 
  or 
  perforated 
  zinc 
  can 
  be 
  placed 
  in 
  the 
  troughs 
  at 
  a 
  suitable 
  

   distance 
  above 
  their 
  real 
  bottom, 
  leaving 
  a 
  space 
  of 
  about 
  1 
  or 
  li 
  inches 
  

   between 
  the 
  wire 
  cloth 
  and 
  the 
  trough 
  bottom. 
  By 
  this 
  means 
  tbe 
  mnd 
  

   that 
  comes 
  into 
  the 
  trough 
  will 
  sift 
  down 
  into 
  the 
  space 
  below 
  the 
  wire 
  

   cloth 
  entirely 
  out 
  of 
  the 
  way 
  of 
  the 
  fish, 
  the 
  movements 
  of 
  the 
  fish 
  

   themselves 
  helping 
  very 
  much 
  to 
  produce 
  this 
  result. 
  Should 
  the 
  

   accumulation 
  of 
  mud 
  in 
  the 
  space 
  below 
  the 
  false 
  bottom 
  of 
  the 
  trough 
  

   become 
  too 
  great, 
  it 
  can 
  easily 
  be 
  sluiced 
  out 
  in 
  varions 
  ways. 
  

  

  When 
  quinnat-salmon 
  eggs 
  are 
  simply 
  to 
  be 
  matured 
  for 
  shipment, 
  

   hatching-trays 
  with 
  ^ 
  or 
  ^ 
  inch 
  square 
  mesli 
  will 
  answer 
  the 
  purpose, 
  

   but 
  when 
  the 
  eggs 
  are 
  to 
  be 
  hatched 
  in 
  them, 
  every 
  alternate 
  strand 
  of 
  

   wire 
  running 
  lengthwise, 
  or, 
  better 
  still, 
  every 
  second 
  and 
  third 
  thread, 
  

   should 
  be 
  left 
  out 
  in 
  order 
  to 
  form 
  an 
  oblong 
  mesh 
  through 
  which 
  the 
  

   newly 
  hatched 
  fry, 
  after 
  separating 
  themselves 
  from 
  the 
  unhatched 
  

   eggs, 
  can 
  escape 
  from 
  the 
  hatching-trays 
  into 
  the 
  troughs 
  below. 
  

  

  