﻿50 
  

  

  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  The 
  egg's 
  retained 
  at 
  tlie 
  station 
  commenced 
  hatching- 
  early 
  in 
  

   April, 
  and 
  ll;(),950,00() 
  fry, 
  i)roduced 
  from 
  them, 
  were 
  liberated 
  at 
  the 
  

   following 
  points: 
  

  

  During 
  the 
  period 
  of 
  incubation 
  the 
  water 
  in 
  the 
  lake 
  became 
  so 
  low, 
  

   on 
  account 
  of 
  a 
  southwest 
  gale, 
  that 
  the 
  suction 
  pipe 
  was 
  above 
  the 
  

   surface 
  of 
  the 
  water, 
  and 
  the 
  supply 
  to 
  the 
  hatchery 
  was 
  cut 
  olf 
  for 
  six 
  

   hours. 
  The 
  closed 
  circulation 
  was 
  used 
  without 
  apparent 
  detriment 
  to 
  

   the 
  eggs 
  during 
  this 
  period. 
  

  

  The 
  use 
  of 
  air 
  jets 
  in 
  keeping 
  the 
  screens 
  in 
  the 
  fry 
  tanks 
  clean 
  and 
  

   free 
  from 
  shells 
  has 
  proved 
  a 
  success. 
  The 
  screens 
  now 
  require 
  little 
  or 
  

   no 
  attention, 
  whereas, 
  under 
  the 
  old 
  jjlan, 
  it 
  took 
  the 
  services 
  of 
  sev- 
  

   eral 
  men 
  to 
  keep 
  them 
  clear 
  when 
  the 
  fry 
  were 
  coming 
  out 
  rapidly. 
  It 
  

   is 
  also 
  believed 
  that 
  under 
  the 
  old 
  system 
  the 
  fry 
  suffered 
  more 
  or 
  less 
  

   from 
  coming 
  in 
  contact 
  with 
  the 
  screens. 
  As 
  now 
  arranged, 
  the 
  jets 
  

   coming 
  up 
  from 
  the 
  bottom 
  on 
  the 
  inside 
  produce 
  active 
  currents 
  of 
  

   water, 
  which 
  prevent 
  the 
  fry 
  and 
  shells 
  from 
  touching 
  the 
  screens. 
  

   The 
  fry 
  are 
  also 
  kept 
  from 
  collecting 
  in 
  large 
  numbers 
  at 
  the 
  bottom 
  

   and 
  smothering, 
  and 
  they 
  are 
  undoubtedly 
  made 
  active 
  and 
  healthy 
  by 
  

   the 
  thorough 
  aeration 
  of 
  the 
  water. 
  

  

  Lalcc 
  herring. 
  — 
  The 
  collection 
  of 
  eggs 
  of 
  this 
  species, 
  although 
  pushed 
  

   earnestly, 
  was 
  almost 
  a 
  complete 
  failure, 
  as 
  very 
  few 
  herring 
  were 
  cap- 
  

   tured 
  this 
  season. 
  From 
  the 
  1,200,000 
  eggs 
  secured, 
  696,000 
  fry 
  were 
  

   hatched 
  and 
  liberated 
  at 
  North 
  Bass 
  Island 
  Reef. 
  

  

  Lal!G 
  trout. 
  — 
  During 
  December 
  1,000,000 
  lake-trout 
  eggs 
  were 
  received 
  

   from 
  Northville, 
  from 
  which 
  685,400 
  fry 
  were 
  hatched 
  and 
  planted 
  on 
  

   Eattlesnake 
  and 
  Ballast 
  Island 
  reefs. 
  

  

  Blacli 
  hass. 
  — 
  During 
  the 
  spring 
  attempts 
  were 
  made 
  to 
  hatch 
  the 
  

   eggs 
  of 
  the 
  small 
  mouthed 
  black 
  bass 
  by 
  artificial 
  fertilization. 
  Male 
  

   and 
  female 
  fishes, 
  apparently 
  in 
  the 
  act 
  of 
  spawning, 
  were 
  taken 
  from 
  

   their 
  beds, 
  but 
  in 
  only 
  one 
  instance 
  were 
  fry 
  hatched 
  fiom 
  eggs 
  col- 
  

   lected 
  in 
  this 
  way. 
  The 
  eggs 
  were 
  forced 
  from 
  the 
  female 
  with 
  great 
  

   difficulty, 
  and 
  in 
  no 
  instance 
  could 
  milt 
  be 
  obtained 
  from 
  the 
  male; 
  

   hence 
  it 
  became 
  necessary 
  to 
  open 
  the 
  fish 
  and 
  remove 
  the 
  spermaries, 
  

   which 
  were 
  then 
  cut 
  up 
  and 
  mixed 
  with 
  the 
  eggs, 
  a 
  little 
  corn 
  starch 
  

   being 
  added 
  to 
  prevent 
  adhesion. 
  The 
  eggs 
  were 
  then 
  placed 
  in 
  the 
  

   McDonald 
  jar 
  and 
  worked 
  as 
  usual. 
  They 
  showed 
  little 
  tendency 
  to 
  

   adhere 
  to 
  each 
  other 
  or 
  to 
  the 
  jar 
  any 
  more 
  than 
  is 
  usual 
  with 
  white- 
  

   fish 
  or 
  pike-perch 
  eggs. 
  On 
  the 
  following 
  day 
  they 
  were 
  taken 
  from 
  the 
  

  

  