﻿MANUAL 
  OF 
  FISH-CULTURE. 
  

  

  149 
  

  

  HATCHERIES 
  AND 
  EQUIPMENT. 
  

  

  The 
  buildiug- 
  for 
  a 
  sliad-liatcliery 
  maybe 
  of 
  a 
  temi)oraiy 
  character, 
  as 
  

   it 
  is 
  used 
  only 
  about 
  two 
  months 
  each 
  year, 
  but 
  am])le 
  light, 
  space, 
  

   ventilation, 
  and 
  arrangements 
  for 
  moderate 
  heating 
  are 
  necessary. 
  The 
  

   steam 
  boiler 
  and 
  pumps 
  should 
  be 
  in 
  a 
  separate 
  structure. 
  

  

  In 
  exceptional 
  cases, 
  as 
  at 
  Central 
  Station, 
  in 
  Washington, 
  river 
  

   water 
  from 
  city 
  pipes 
  can 
  be 
  utilized. 
  If 
  the 
  water 
  supi:)ly 
  is 
  taken 
  

   directly 
  from 
  the 
  river 
  the 
  suction 
  should 
  be 
  i)ut 
  below 
  low-water 
  mark, 
  

   and 
  the 
  end 
  provided 
  with 
  a 
  strainer 
  and 
  kept 
  ofl" 
  the 
  bottom 
  to 
  avoid 
  

   sediment. 
  The 
  water 
  should 
  be 
  supplied 
  from 
  an 
  open 
  tank, 
  not 
  by 
  a 
  

   force-pump, 
  but 
  if 
  it 
  is 
  taken 
  from 
  municipal 
  i)ipes 
  a 
  regulator 
  may 
  be 
  

   employed. 
  A 
  fall 
  of 
  16 
  feet 
  is 
  desirable, 
  or 
  8 
  pounds 
  pressure 
  per 
  square 
  

   inch 
  at 
  the 
  top 
  of 
  the 
  hatching-jars. 
  The 
  amount 
  required 
  is 
  2 
  quarts 
  

   per 
  minute 
  to 
  each 
  jar. 
  

  

  Scale 
  

  

  Section 
  A-B 
  

  

  'M/'M 
  

  

  Upper 
  figiiro 
  sliowiiig 
  vie^T 
  from 
  

   .above. 
  

  

  Lower 
  loft-lianl 
  figure 
  : 
  End 
  view 
  

   •sliowing 
  liateliinff-Jar 
  in 
  position. 
  

  

  Lower 
  right-lianrl 
  figure: 
  Cro.ss- 
  

   section 
  showing 
  tliedrain-ijiiie 
  and 
  

   trougliju 
  center 
  of 
  table. 
  

  

  Shad-batching 
  table. 
  

  

  The 
  jars 
  are 
  arranged 
  on 
  tables, 
  as 
  shown 
  in 
  the 
  cut. 
  From 
  a 
  large 
  

   iron 
  pipe, 
  branch 
  piping 
  of 
  1.^ 
  to 
  2 
  inches 
  diameter 
  is 
  run 
  over 
  each 
  

   table, 
  where 
  ^-inch 
  brass 
  pet-cocks 
  are 
  inserted 
  6 
  inches 
  apart. 
  The 
  

   jars 
  are 
  connected 
  with 
  the 
  supply-i)ii)es 
  by 
  half 
  inch 
  rubber 
  tubiug. 
  

   Tight 
  drains 
  are 
  required 
  to 
  carry 
  away 
  the 
  waste 
  water. 
  Collector- 
  

   tanks 
  for 
  fry 
  are 
  rectangular 
  and 
  may 
  be 
  of 
  glass 
  or 
  wood, 
  the 
  former 
  

   possibly 
  preferred. 
  

  

  