﻿502 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [14] 
  

  

  tended 
  to 
  keep 
  the 
  temperature 
  in 
  the 
  latter 
  constant, 
  so 
  that 
  all 
  the 
  

   eggs 
  developed 
  at 
  the 
  same 
  rate. 
  In 
  other 
  apparatus 
  devised 
  in 
  imita- 
  

   tion 
  of 
  Chester's 
  device, 
  but 
  in 
  which 
  the 
  hatching 
  vessel 
  was 
  not 
  sur- 
  

   rounded 
  by 
  a 
  constant 
  supply 
  of 
  fresh, 
  cold 
  sea- 
  water, 
  irregularities 
  of 
  

   development 
  were 
  often 
  very 
  pronounced. 
  This 
  seemed 
  to 
  be 
  due 
  to 
  

   the 
  unequal 
  temperature 
  of 
  the 
  water 
  at 
  the 
  sides 
  and 
  center 
  of 
  the 
  

   vessel, 
  owing 
  to 
  radiation 
  from 
  the 
  atmosphere 
  of 
  the 
  room. 
  In 
  these 
  

   other 
  forms 
  of 
  apparatus, 
  development 
  seemed 
  to 
  proceed 
  normally 
  

   until 
  within 
  a 
  day 
  or 
  two 
  of 
  hatching, 
  when 
  the 
  eggs 
  would 
  suddenly 
  

   sink 
  and 
  die. 
  

  

  (5) 
  The 
  post-larval 
  stages 
  of 
  development 
  of 
  the 
  cod. 
  — 
  I 
  have 
  not 
  seen 
  

   any 
  of 
  the 
  more 
  advanced 
  stages 
  ; 
  none 
  older 
  in 
  fact 
  than 
  about 
  ten 
  

   days 
  after 
  hatching. 
  A. 
  Agassiz 
  30 
  has 
  figured 
  two 
  stages 
  believed 
  to 
  

   appertain 
  to 
  the 
  common 
  cod. 
  These 
  show 
  the 
  chin 
  barbel 
  and 
  the 
  

   ventral 
  fins 
  developed, 
  neither 
  of 
  which 
  were 
  yet 
  developed 
  in 
  the 
  old- 
  

   est 
  stages 
  seen 
  by 
  me. 
  These 
  specimens 
  measured 
  respectively 
  20 
  

   and 
  28 
  mm 
  in 
  length, 
  or 
  from 
  four 
  to 
  five 
  times 
  as 
  long 
  as 
  the 
  oldest 
  speci- 
  

   mens 
  I 
  have 
  seen, 
  so 
  that 
  there 
  still 
  remains 
  a 
  large 
  gap 
  to 
  be 
  filled 
  up 
  

   in 
  the 
  iconography 
  of 
  the 
  stages 
  of 
  development 
  of 
  this 
  species. 
  

  

  II. 
  — 
  Eoccus 
  lineatus 
  (Bloch) 
  Gill. 
  (The 
  Striped 
  Bass, 
  or 
  Boclcfish.) 
  

  

  The 
  artificial 
  fertilization 
  of 
  the 
  eggs 
  of 
  the 
  striped 
  bass 
  was, 
  I 
  be- 
  

   lieve, 
  first 
  accomplished 
  by 
  Mr. 
  E. 
  H. 
  Walke, 
  of 
  the 
  Dnited 
  States 
  Fish 
  

   Commission, 
  in 
  1879, 
  and 
  in 
  1881 
  Mr. 
  S. 
  G. 
  Worth 
  31 
  reported 
  his 
  suc- 
  

   cess 
  of 
  the 
  previous 
  year 
  in 
  the 
  artificial 
  fertilization 
  of 
  the 
  eggs 
  of 
  this 
  

   species. 
  The 
  species 
  is 
  very 
  fertile; 
  a 
  single 
  female 
  was 
  estimated 
  by 
  

   Mr. 
  Worth 
  to 
  have 
  contained 
  3,000,000 
  eggs 
  in 
  her 
  roes. 
  Spawning 
  

   and 
  hatching 
  appear 
  to 
  occur 
  in 
  fresh 
  water, 
  and 
  according 
  to 
  Mr. 
  

   Worth 
  the 
  eggs 
  are 
  of 
  less 
  specific 
  gravity 
  than 
  those 
  of 
  the 
  shad, 
  ex- 
  

   tremely 
  transparent 
  or 
  pellucid 
  when 
  in 
  the 
  water, 
  and 
  measuring 
  nearly 
  

   one-seventh 
  of 
  an 
  inch 
  in 
  diameter 
  after 
  impregnation, 
  when 
  the 
  zona 
  

   radiata 
  becomes 
  greatly 
  distended 
  and 
  freed 
  from 
  contact 
  with 
  the 
  vi- 
  

   tellus. 
  The 
  freshly 
  extended 
  ova 
  were 
  found 
  to 
  be 
  smaller 
  than 
  those 
  

   of 
  the 
  shad, 
  and 
  the 
  vitellus 
  was 
  of 
  a 
  decidedly 
  greenish 
  color. 
  From 
  

   the 
  foregoing 
  data 
  it 
  may 
  be 
  assumed 
  that 
  there 
  exists 
  in 
  the 
  egg 
  of 
  this 
  

   species, 
  as 
  in 
  that 
  of 
  the 
  shad, 
  a 
  very 
  spacious 
  " 
  breathing 
  chamber," 
  

   or 
  water 
  space, 
  developed 
  between 
  the 
  vitellus 
  and 
  zona 
  at 
  the 
  time 
  of 
  

   impregnation, 
  in 
  consequence 
  of 
  the 
  distension 
  of 
  the 
  latter 
  with 
  water 
  

   taken 
  in 
  through 
  the 
  pore-canals. 
  At 
  a 
  temperature 
  of 
  66° 
  to 
  67° 
  Fahr. 
  

   hatching 
  began 
  at 
  the 
  end 
  of 
  48 
  hours. 
  

  

  The 
  foregoing 
  information 
  is 
  derived 
  from 
  the 
  paper 
  by 
  Mr. 
  Worth, 
  

   i.nd, 
  as 
  there 
  can 
  be 
  no 
  doubt 
  of 
  the 
  fact 
  that 
  the 
  eggs 
  taken 
  were 
  those 
  

   of 
  the 
  striped 
  bass, 
  we 
  must 
  suppose, 
  if 
  the 
  young 
  fish 
  identified 
  by 
  A. 
  

  

  30 
  A. 
  Agassiz. 
  On 
  the 
  young 
  stages 
  of 
  osseous 
  fishes, 
  part 
  iii. 
  Proc. 
  Am. 
  Acad. 
  Arts 
  

   and 
  Sci., 
  xvii, 
  1882, 
  pi. 
  viii, 
  figs. 
  4 
  and 
  5, 
  p. 
  296. 
  

  

  31 
  S. 
  G. 
  Worth. 
  The 
  artificial 
  propagation 
  of 
  the 
  striped 
  hass 
  (lloccus 
  lineatua) 
  on 
  

   Albemarle 
  Sound. 
  Bull. 
  U. 
  S. 
  Fish. 
  Com.,i, 
  1881, 
  pp. 
  174-177. 
  

  

  