lieber  die  Acclimatisation  der  Salmoneer  kt  Australien  mtd  Neu-Sceland. 
369 
Laichplätze  auszuwähien,  zumal  da  sie  diese  Stellen  ganz  in  der  Nahe 
ihrer  eigenen  Geburtsstätten  antrafen  l).« 
»Das  letzte  Erscheinen  von  Lachsen,  welches  im  Derwenlsirom 
beobachtet  wurde,  hat  am  21.  April  stattgefunden2).« 
»Das  Aufsteigen  der  Lachse  ist  demnach  von  Ncw-Norfolk  bis  zur 
Mündung  des  Plentyflusses  (ihrer  Heimath),  das  heisst  bis  auf  eine 
Länge  von  8 Meilen  bestimmt  festgestellt.  Sie  scheinen  übrigens  nicht 
in  einem  Zuge  aufgestiegen  zu  sein,  sondern  entweder  in  mehreren 
Zügen,  oder  in  einem  lang  ausgedehnten  Zuge3).« 
»Man  ist  übrigens  der  Meinung,  dass  es  nur  wenige  Flüsse  giebt, 
in  weichen  so  wenige  Feinde  der  jungen  Lachse  vorhanden  sind , als 
der  Derwent,  ausser  einigen  Raubvögeln  sind  es  überhaupt  nur  Aale 
und  ein  seilen  über  V2  Pfund  schwer  werdender  Fisch,  der  den  Local- 
namen Mull  et  trägt,  gegen  welche  die  Lachse  zu  kämpfen  haben 
werden  9.« 
i ) Ebenda  : »This  portion  of  the  Derwent  in  which  the  Salmon  hove  been  thus  ob- 
served  to  such  advantage , and  wher  they  had  evidently  congregated  in  considerable 
nmnbers,  consists  of  a reach  of  deep  still  water  four  or  five  h undred  yards  in  lenglh, 
boimded  at  ach  exiremity  by  a rapid  which  at  the  lower  and  passes  over  a fine  bed  of 
gravel,  likely.  in  Mr.  Rcmsboltom’s  opinion , to  he  selecled  by  the  Salmon  as  a suüable 
place  for  forming  iheir  nests  and  depositing  their  ova , and  is  in  close  proximity  to  the 
mouth  of  the  Plenly  ( their  parent  hörne),  into  which  liiere  was  every  reason  to  expect 
(hat  some  of  thern  . ould  enter  for  the  purpose  of  shedding  iheir  spaiun .« 
2)  Ebenda  : »Near  a place  called  Beil’s  Terrace  , close  to  Neiv-Norfoik;  where 
a fine  gravel  bed  exists , the  fish  were  seen  on  various  occasions  by  more  than  one  ob- 
server,  lang  after  their  appearance  near  the  Plenty.  The  last  known  occasion,  on  which 
tiw  Salmon  have  been  observed,  occured  on  the  2t.  April , when  two  were  seen  to  leap 
from  the  water  in  a very  distinci  and  striking  manner  by  the  same  Commissionen,  to 
whom  they  had  before  exhibited  themselves  r-,  so  satisfactory  a manner,  near  the  mouth 
oj  the  Plenty,  and  by  another  Gentleman  at  precisely  the  same  spot,  where  they  had  first 
been  noticed  on  their  re  turn  from  Sali  Water.« 
3)  Ebenda  , »The  progress  of  the  Salmon  has  thus  been  clearly  trace'd  from  New 
Norfolk  to  the  mouth  of  the  Plenty,  — a space  , following  the  course  of  the  Derwent,  of 
iipmards  of  8 miles  in  length.  But  the  instances  above  related  by  no  means  embrace  all 
the  occasions , on  which  the  Salmon  have  been  seen  in  Ihe  River.  — The  fish  do  not  ap- 
pcor  to  have  passed  up  the  slream  in  one  body ; for,  after  iheir  appearance  in  the  Der- 
went  at  ihe  various  .prints  obove  indicaled , they  have  been  subsequenUy  seen  at  severol 
placcs  between  the  Plenty  and  New  Norfolk , showing  that  they  did  not  trag  et  in  one 
body  . but  by  detachements  or  in  a conünuous  stream .« 
4)  Ebenda  »The  Commiss'oners  believe  that  there  are  few  rivers  approaching 
l’ie  swe  of  the  Derwent , where  so  small  a number  of  enemies  dangerous  to  the  Life  of 
he  young  Salmon  are  to  be  found.  — Eeis  and  Ihe  small  fish  locally  called  Mu  l lei, 
which  seldom  attain  a weight  of  more  than  lf,  ff,  with  some  predaceous  birds,  are  ihe 
oniy  foes,  against  which  they  will  have  to  contend  in  the  fresh  waters  of  that  slream .« 
