﻿!92 
  

  

  REPOKT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  of 
  food 
  contained 
  in 
  each 
  liter 
  of 
  the 
  water 
  over 
  the 
  natural 
  oyster 
  

   grounds, 
  it 
  follows 
  that 
  in 
  collecting 
  its 
  daily 
  meal 
  (11,453 
  diatoms) 
  an 
  

   oyster 
  must 
  filter 
  altogether 
  about 
  500 
  c. 
  c, 
  or 
  16 
  ounces, 
  of 
  water, 
  

   and 
  that 
  about 
  167 
  c. 
  c, 
  or 
  5^ 
  ounces, 
  are 
  filtered 
  per 
  hour. 
  The 
  length 
  

   of 
  the 
  feeding 
  time 
  in 
  any 
  locality 
  very 
  probably 
  depends 
  upon 
  the 
  

   richness 
  of 
  the 
  supply 
  of 
  food 
  in 
  the 
  water, 
  the 
  time 
  of 
  feeding 
  becom- 
  

   ing 
  longer 
  as 
  the 
  food 
  supply 
  diminishes 
  in 
  quantity. 
  Not 
  until 
  the 
  

   supply 
  of 
  food 
  falls 
  below 
  an 
  amount 
  one-eighth 
  of 
  that 
  found 
  in 
  

   Newport 
  River 
  would 
  it 
  fail 
  to 
  support 
  oj^sters. 
  The 
  "coon" 
  o^^sters 
  

   on 
  the 
  tops 
  of 
  the 
  high 
  reefs, 
  although 
  exposed 
  to 
  the 
  air 
  for 
  several 
  

   hours 
  each 
  day, 
  are 
  in 
  no 
  danger 
  of 
  starvation 
  so 
  long 
  as 
  they 
  are 
  cov- 
  

   ered 
  by 
  the 
  tide 
  for 
  a 
  few 
  hours 
  each 
  time, 
  and 
  so 
  long 
  as 
  the 
  food 
  

   supph" 
  retains 
  its 
  present 
  richness. 
  

  

  Results 
  of 
  expert 
  iiimts 
  to 
  determine 
  rate 
  of 
  feeding. 
  

  

  Time 
  of 
  examination. 
  

  

  Stomach 
  contents. 
  

  

  Melosira 
  

   seulpta. 
  

  

  Plenro- 
  

   sigma 
  

   spen- 
  

   cerii. 
  

  

  Eupodis- 
  

  

  cus 
  

   radiatus. 
  

  

  Navicula 
  

   didyma. 
  

  

  1900. 
  

   July 
  31 
  

   Aug. 
  4 
  

  

  Do!!! 
  

  

  Aug. 
  6 
  

   Aug. 
  9 
  

  

  Do... 
  

  

  Do... 
  

  

  1902. 
  

   Aug. 
  19 
  

   Aug. 
  22 
  

  

  Do... 
  

  

  Do... 
  

  

  Do... 
  

  

  Do... 
  

  

  Sept. 
  1 
  

   Sept. 
  4 
  

  

  Do... 
  

  

  Do... 
  

  

  When 
  taken 
  from 
  bed 
  . 
  

  

  Alter 
  fasting 
  4 
  days 
  

  

  After 
  feeding 
  2 
  hours 
  . 
  . 
  

   After 
  feeding 
  3^ 
  hours 
  . 
  

  

  When 
  taken 
  from 
  bed 
  . 
  

   After 
  fasting 
  3 
  days.... 
  

   After 
  feeding 
  2 
  hours 
  . 
  , 
  

   After 
  feeding 
  4 
  hours 
  . 
  , 
  

  

  When 
  taken 
  from 
  bed 
  

   After 
  fasting 
  3 
  days. 
  . 
  . 
  

   After 
  feeding 
  1 
  hour 
  . 
  . 
  

   After 
  feeding 
  2 
  hours 
  . 
  

   After 
  feeding 
  3 
  hours 
  . 
  

   After 
  feeding 
  4 
  hours 
  . 
  

  

  When 
  taken 
  from 
  bed 
  . 
  

  

  After 
  fasting 
  3 
  days 
  

  

  After 
  feeding 
  1 
  hour 
  . 
  . 
  

   After 
  feeding 
  2 
  hours 
  . 
  , 
  

  

  302 
  

   1,512 
  

  

  3,193 
  

  

  990 
  

  

  1,820 
  

  

  1,216 
  

   159 
  

   121 
  

  

  5, 
  846 
  

   79 
  

   403 
  

  

  4,372 
  

  

  75 
  

   180 
  

  

  3, 
  551 
  

  

  53 
  

  

  987 
  

  

  530 
  

  

  2, 
  809 
  

  

  10, 
  494 
  

  

  5, 
  300 
  

   205 
  

   362 
  

  

  1, 
  982 
  

  

  9,954 
  

   277 
  

   806 
  

  

  2,300 
  

  

  8,506 
  

  

  750 
  

  

  1,260 
  

  

  2,800 
  

  

  4,240 
  

   53 
  

   1,040 
  

   742 
  

   3,074 
  

   11, 
  236 
  

  

  6,569 
  

   424 
  

   483 
  

  

  2,432 
  

  

  Average 
  calculated 
  from 
  the 
  above. 
  

  

  