.
\\\
\\
_
_
,,
_
\
\
\\\\\\\\\
'
24
‘.
-
The AquaticEhæärûment .
_
'
_\
'
is the basic temperature band generally used in tropical-fishk6eping;
,
This figure is based ..on the long
as
being that best suited to the Common community type en— ‘
Vironment, and as a good starting point for tropical fish whose
temperature characteristics are unknown. -Obviously a few degrees
‘
side of this figure will not harm healthy fish as long as there are
no rapid changes, but a sudden drop of only 5° Fi(3° C) cari be fatal
.
as a_result of shock or the development of disease;
.
«
"
-
_
The so-Called coldwater group of fish shows several interesting
aspects of temperature tolerance. The common goldfish and“ most
_
its varieties are unusually adaptable to gradual- temperature
changes. They are frequently kept in tropical conditions yet. also
survive winters in iced-over ponds. Some of the fancier varieties
tend to favour the-warmer ranges but generally the goldfish seems
able to succeed in all situations. On the other hand, various wild
'
coldwater fishes do not survive in aquaria or shallow ponds because
,
they require colder temperatures than can be provided with normal
,
equipment. The Perch is a good example of this and many native
marine fishes suffer from the same disadvantage. As no suitable
refrigerating equipment for aquaria is readily available, theSe fish
‘
‘
cannot be kept very successfully, which “is agreat pity because for
instance a Perch
ina rtruly reprCsentative—environ—
,
ment is probably as attractive asany
other freshw‘ater-fiSh. …
Once a satisfäctory temperature has been
speéiesthis will normally be altered only tovinduce reproductionaor
'
,
t0'- combat disease. Otherwise temperatures… are
.,
: aut0matically around this fixed value and the
groW=ac—custor‘ned
"
_to a virtually constant temperature. Whether this is badfor:thçmâs
difficult to say. It Would seem that as long as the—value
'
the normal range of their natural adaption they should
‘?“,
is …questionable whether an old fish having spent all its lifeat. one
_
_—
could survive a
change of say 5°F (3°C)
Ï
and also whether aquarium bred fishescould cope with-the fluc—
tuations encoùntered in_ynatirre. It would seem'gthathaving accùst0m_—
'”
‘
ed, our fishes. to live at virtually
'
_
take every piecaution agains-t-sudden orperiniarlent changes ,,_
]
.,
mixed
,),
situation may*be‘eomë .more
unless the1nhab1tantsall = ;”
live
Withinthe f_sam‘ec‘,}ët€mperature rangé;i Plants do ot
seemtoadaptwetoether temperatures and the requirements
manyofthemoreexot1caquat1eanimalsarenot well
»
moment
73 “, …
r
a:»!f '
?; ;
e
>
,
à,…
\\
…
,
,
“,
\
‘\'
‘
_
"
\\\
\\
_
_
,,
_
\
\
\\\\\\\\\
'
24
‘.
-
The AquaticEhæärûment .
_
'
_\
'
is the basic temperature band generally used in tropical-fishk6eping;
,
This figure is based ..on the long
as
being that best suited to the Common community type en— ‘
Vironment, and as a good starting point for tropical fish whose
temperature characteristics are unknown. -Obviously a few degrees
‘
side of this figure will not harm healthy fish as long as there are
no rapid changes, but a sudden drop of only 5° Fi(3° C) cari be fatal
.
as a_result of shock or the development of disease;
.
«
"
-
_
The so-Called coldwater group of fish shows several interesting
aspects of temperature tolerance. The common goldfish and“ most
_
its varieties are unusually adaptable to gradual- temperature
changes. They are frequently kept in tropical conditions yet. also
survive winters in iced-over ponds. Some of the fancier varieties
tend to favour the-warmer ranges but generally the goldfish seems
able to succeed in all situations. On the other hand, various wild
'
coldwater fishes do not survive in aquaria or shallow ponds because
,
they require colder temperatures than can be provided with normal
,
equipment. The Perch is a good example of this and many native
marine fishes suffer from the same disadvantage. As no suitable
refrigerating equipment for aquaria is readily available, theSe fish
‘
‘
cannot be kept very successfully, which “is agreat pity because for
instance a Perch
ina rtruly reprCsentative—environ—
,
ment is probably as attractive asany
other freshw‘ater-fiSh. …
Once a satisfäctory temperature has been
speéiesthis will normally be altered only tovinduce reproductionaor
'
,
t0'- combat disease. Otherwise temperatures… are
.,
: aut0matically around this fixed value and the
groW=ac—custor‘ned
"
_to a virtually constant temperature. Whether this is badfor:thçmâs
difficult to say. It Would seem that as long as the—value
'
the normal range of their natural adaption they should
‘?“,
is …questionable whether an old fish having spent all its lifeat. one
_
_—
could survive a
change of say 5°F (3°C)
Ï
and also whether aquarium bred fishescould cope with-the fluc—
tuations encoùntered in_ynatirre. It would seem'gthathaving accùst0m_—
'”
‘
ed, our fishes. to live at virtually
'
_
take every piecaution agains-t-sudden orperiniarlent changes ,,_
]
.,
mixed
,),
situation may*be‘eomë .more
unless the1nhab1tantsall = ;”
live
Withinthe f_sam‘ec‘,}ët€mperature rangé;i Plants do ot
seemtoadaptwetoether temperatures and the requirements
manyofthemoreexot1caquat1eanimalsarenot well
»
moment
73 “, …
r
a:»!f '
?; ;
e
>
,
à,…
\\
…
,
,
“,
\
‘\'
‘
_
"