﻿34 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  SO 
  transparent 
  as 
  that 
  of 
  Craig 
  Brook, 
  and 
  the 
  bottom 
  can 
  hardly 
  be 
  

   seen 
  at 
  the 
  depth 
  of 
  4 
  feet. 
  This 
  circumstance 
  is 
  regarded 
  as 
  favor- 
  

   able. 
  The 
  inclosure 
  is 
  located 
  on 
  the 
  lower 
  stretches 
  of 
  the 
  brook, 
  not 
  

   more 
  than 
  half 
  a 
  mile 
  from 
  its 
  mouth, 
  with 
  low 
  banks 
  on 
  either 
  hand 
  

   and 
  a 
  very 
  gentle 
  current 
  flowing 
  over 
  a 
  bed 
  that 
  is 
  for 
  the 
  most 
  part 
  

   gravelly 
  but 
  in 
  part 
  consists 
  of 
  a 
  peaty 
  mud 
  that 
  supports 
  a 
  luxurious 
  

   growth 
  of 
  aquatic 
  vegetation. 
  The 
  general 
  depth 
  is 
  less 
  than 
  4 
  feet, 
  

   but 
  two 
  of 
  the 
  pools 
  are 
  8 
  feet 
  deep 
  and 
  another 
  is 
  6 
  feet 
  deep. 
  The 
  

   width 
  of 
  the 
  stream 
  is 
  from 
  20 
  to 
  80 
  feet. 
  The 
  inclosure 
  occupies 
  the 
  

   entire 
  stream 
  for 
  a 
  distance 
  of 
  2,200 
  feet, 
  embracing 
  an 
  area 
  of 
  about 
  

   2J 
  acres. 
  At 
  either 
  end 
  is 
  a 
  substantial 
  barrier, 
  consisting 
  of 
  wooden 
  

   racks, 
  which 
  obstruct 
  the 
  current 
  very 
  slightly 
  but 
  confine 
  the 
  salmon 
  

   securely. 
  The 
  lower 
  barrier 
  is 
  provided 
  with 
  a 
  gate, 
  which 
  swings 
  open 
  

   to 
  admit 
  boats, 
  and 
  at 
  the 
  upper 
  barrier 
  are 
  located 
  the 
  spawning- 
  house 
  

   and 
  watchman's 
  camp 
  and 
  a 
  small 
  storehouse. 
  

  

  The 
  temperature 
  of 
  the 
  water 
  during 
  the 
  summer 
  months 
  generally 
  

   ranges 
  between 
  60° 
  and 
  70° 
  F., 
  but 
  the 
  surface 
  temperature 
  occasionally 
  

   rises 
  to 
  76°, 
  80°, 
  and 
  even 
  84°. 
  louring 
  sultry 
  weather 
  the 
  temperature 
  

   at 
  the 
  bottom 
  has 
  been 
  observed 
  and 
  in 
  the 
  deeper 
  pools 
  has 
  been 
  found 
  

   to 
  be 
  notably 
  lower 
  than 
  at 
  the 
  surface. 
  Thus 
  a 
  temperature 
  of 
  75° 
  

   at 
  the 
  surface 
  has 
  been 
  found 
  to 
  be 
  accompanied 
  by 
  08° 
  at 
  the 
  bottom; 
  

   78° 
  by 
  74°; 
  and 
  81° 
  by 
  72°. 
  It 
  is 
  probable 
  that 
  to 
  the 
  existence 
  of 
  these 
  

   deeper 
  jjools 
  the 
  survival 
  of 
  the 
  salmon 
  through 
  extremely 
  hot 
  weather 
  

   may 
  be 
  ascribed. 
  

  

  After 
  their 
  liberation 
  in 
  the 
  inclosure 
  the 
  salmon 
  are 
  at 
  first 
  quite 
  

   active, 
  swimming 
  about 
  and 
  often 
  leaping 
  into 
  the 
  air. 
  This 
  continues 
  

   for 
  several 
  weeks. 
  After 
  that 
  they 
  become 
  very 
  quiet, 
  lying 
  in 
  the 
  

   deepest 
  pools 
  and 
  rarely 
  showing 
  themselves 
  until 
  the 
  approach 
  of 
  the 
  

   spawning 
  season. 
  

  

  Most 
  of 
  the 
  deaths 
  occur 
  during 
  the 
  first 
  few 
  weeks 
  of 
  their 
  impris- 
  

   onment, 
  doubtless 
  in 
  consequence 
  of 
  injuries 
  received 
  in 
  capture 
  or 
  

   during 
  transfer, 
  though 
  high 
  temperature 
  in 
  the 
  inclosure 
  itself 
  about 
  

   the 
  time 
  of 
  the 
  introduction 
  of 
  the 
  salmon 
  may 
  be 
  one 
  of 
  the 
  causes 
  of 
  

   mortality. 
  Fish 
  that 
  escape 
  the 
  dangers 
  of 
  June 
  appear 
  to 
  become 
  

   acclimated 
  and 
  able 
  to 
  endure 
  the 
  high 
  temperatures 
  of 
  July 
  and 
  

   August 
  without 
  injury. 
  

  

  Notwithstanding 
  salmon 
  enter 
  the 
  rivers 
  in 
  spring 
  or 
  early 
  summer, 
  

   ascending 
  at 
  once 
  to 
  their 
  upper 
  waters 
  and 
  there, 
  in 
  fresh 
  water, 
  

   awaiting 
  the 
  spawning 
  season, 
  fresh 
  water 
  is 
  not 
  essential 
  to 
  the 
  activ- 
  

   ity 
  of 
  their 
  reproductive 
  functions. 
  At 
  the 
  Canadian 
  fish-breeding 
  

   station 
  of 
  Tadoussac, 
  where 
  salmon 
  are 
  almost 
  the 
  only 
  fish 
  cultivated, 
  

   it 
  has 
  for 
  many 
  years 
  been 
  the 
  practice 
  to 
  hold 
  their 
  brood 
  fish 
  in 
  an 
  

   inclosure 
  supplied 
  with 
  salt 
  water, 
  which 
  flows 
  and 
  ebbs 
  through 
  tlie 
  

   barrier 
  confining 
  the 
  salmon, 
  and 
  the 
  development 
  of 
  eggs 
  and 
  milt 
  is 
  

   in 
  no 
  wise 
  unfavorably 
  aftected, 
  

  

  