﻿MANUAL 
  OF 
  FISH-CULTURE. 
  89 
  

  

  Adult 
  fish 
  are 
  very 
  liable 
  to 
  be 
  affected 
  with 
  fungus, 
  which 
  generally 
  

   appears 
  after 
  a 
  bruise 
  or 
  hurt, 
  or 
  wlien 
  the 
  fish 
  are 
  in 
  au 
  emaciated 
  

   condition. 
  If 
  the 
  trouble 
  results 
  from 
  an 
  injury, 
  it 
  can 
  often 
  be 
  cured 
  

   before 
  it 
  spreads 
  to 
  the 
  sound 
  flesh, 
  bnt 
  if 
  fungus 
  spreads 
  like 
  a 
  slimy 
  

   web 
  all 
  over 
  the 
  fish, 
  it 
  is 
  fatal. 
  Fish 
  must 
  bo 
  handled 
  very 
  carefully 
  

   daring 
  the 
  spawning 
  season 
  to 
  prevent 
  scarifying 
  the 
  body 
  in 
  any 
  way, 
  

   as 
  they 
  are 
  especially 
  susceptible 
  to 
  fungus 
  at 
  that 
  period. 
  Should 
  it 
  

   occur, 
  the 
  fish 
  must 
  be 
  caught 
  at 
  once, 
  rubbed 
  with 
  salt 
  on 
  the 
  affected 
  

   part, 
  and 
  then 
  released 
  in 
  a 
  pond 
  or 
  tank 
  by 
  itself, 
  where 
  it 
  can 
  be 
  

   caught 
  for 
  further 
  treatment 
  in 
  a 
  day 
  or 
  two, 
  while 
  those 
  affected 
  all 
  

   over 
  the 
  body 
  should 
  be 
  killed 
  and 
  thrown 
  out 
  at 
  once. 
  

  

  "Glassy 
  eggs" 
  may 
  be 
  the 
  result 
  of 
  overretention 
  of 
  the 
  eggs 
  on 
  the 
  

   part 
  of 
  the 
  parent 
  fish. 
  If 
  the 
  eggs 
  are 
  not 
  delivered 
  within 
  a 
  reason- 
  

   able 
  length 
  of 
  time, 
  say 
  from 
  36 
  to 
  48 
  hours 
  after 
  they 
  fall 
  from 
  the 
  

   ovaries 
  into 
  the 
  abdomen, 
  they 
  are 
  surrounded 
  with 
  a 
  thin 
  watery 
  fluid, 
  

   having 
  a 
  glassy 
  appearance, 
  which 
  if 
  allowed 
  to 
  come 
  in 
  contact 
  with 
  

   water 
  will 
  change 
  to 
  a 
  milky 
  white, 
  and 
  the 
  eggs 
  absorbing 
  this 
  fluid 
  

   become 
  hard 
  and 
  " 
  glassy," 
  after 
  which 
  fecundation 
  is 
  imjiossible. 
  

   Many 
  thousand 
  eggs 
  have 
  been 
  lost 
  annnally 
  on 
  this 
  account, 
  and 
  many 
  

   brood 
  fisl^ 
  lost 
  or 
  rendered 
  worthless 
  from 
  the 
  same 
  cause. 
  The 
  fish 
  in 
  

   captivity 
  will 
  not 
  spawn 
  of 
  their 
  own 
  accord 
  unless 
  they 
  have 
  access 
  

   to 
  gravel 
  or 
  earth 
  in 
  which 
  to 
  make 
  nests. 
  If 
  attention 
  is 
  not 
  given 
  to 
  

   the 
  spawning 
  fish 
  and 
  their 
  eggs 
  taken 
  when 
  ripe, 
  they 
  soon 
  become 
  

   very 
  dark 
  in 
  color, 
  the 
  abdomen 
  swells, 
  and 
  sometimes 
  the 
  head 
  will 
  

   enlarge, 
  causing 
  the 
  eyes 
  to 
  protrude. 
  Under 
  these 
  conditions 
  the 
  fish 
  

   will 
  die 
  in 
  a 
  few 
  days, 
  but 
  with 
  free 
  and 
  easy 
  access 
  to 
  the 
  raceway 
  

   they 
  will 
  not 
  often 
  be 
  thus 
  affected. 
  

  

  