'
…
_
,
Temperature“
,
23
Each Species tolerates only a relativelynàrr0w temperature range
7
which reflects the prevailing climatic conditions in its natural habitat.
—
_
Outside this range, a further band exists in which the fish can “live,
but not very well
it easily becomes sick, does not grow properly,
and may
not reproduce. Beyond these outer limits the fish dies, : ‘
'
through the slowing down at low temperatures of its metabolism, or
its inability at high temperatures to cope with the additional load
on
its system coupled with problems caused by the lack of oxygen
_
'
'
in the water.
_
_
Table 2 shows the preferred and tolerated temperature ranges
"
of some common species. It should be noticed that this table
the two major divisions of aquarium fishes, namely,
Tropical and Coldwater, reflecting the overwhelming importance of
-
environmental temperature in their lives.
Table 2. PREFERRED AND TOLERATED TEMPERATURE RÀNGES
'
_
_
OF SOME COMMON SPECIES (° F)
Preferred
Tolerated
Goldfish
55—65
35—95
,
_
Guppy
65—75
'
»
40-95 -
-
Angelfish
72—82
60—90
_
ln «artificial environments, because of the limitations of available
equipment, situations which require the application of heat to achieve
any required temperature are usually maintained at some more or”
Ï
less constant value, rather than being allowed to
over a
limited range in daily and seasonal cycles, as
in nature. Thisr-isparti:
cularly true today due to the use of electrical heating methods: ]
_
In former days, when gas and solid fuelboilers Were used—to he&t_
fish houses for instance, cycles could be arrahgedfætirlÿ. easily, and
in “fact often could not be avoided due to"thegreaterinuenceof
“{
ambient temperature on these; systems. This—, however,was probably
Ü
the only advantage of the old
it is d‘oub‘tful whether
this property was often exploited intentionally. The temperature
Of the environments in“which tropical fish are kept
main—,
‘
tained Within about 4°F (2°«G) —of the ‘chosen point.lt is possible,
by obtaining special equipment ‘or by
…
_
’
nally, and paying some-attention tothe situation
of the
to“ produce a differential of} onlyr 1°‘ÏF (0.50 C) but “this rsun—
"
is certainly of
benefit to the fish.“ '
‘
'
'
_:
The selected temperature should be «representative of
’
‘dayüme Surroundingsf i’n
environmeht durmgthe summer
period— of ”its,:ahnual
middle temperature
of 1 76°F
C)
'ï
.
;
with
from 74—78°F
—
…
_
,
Temperature“
,
23
Each Species tolerates only a relativelynàrr0w temperature range
7
which reflects the prevailing climatic conditions in its natural habitat.
—
_
Outside this range, a further band exists in which the fish can “live,
but not very well
it easily becomes sick, does not grow properly,
and may
not reproduce. Beyond these outer limits the fish dies, : ‘
'
through the slowing down at low temperatures of its metabolism, or
its inability at high temperatures to cope with the additional load
on
its system coupled with problems caused by the lack of oxygen
_
'
'
in the water.
_
_
Table 2 shows the preferred and tolerated temperature ranges
"
of some common species. It should be noticed that this table
the two major divisions of aquarium fishes, namely,
Tropical and Coldwater, reflecting the overwhelming importance of
-
environmental temperature in their lives.
Table 2. PREFERRED AND TOLERATED TEMPERATURE RÀNGES
'
_
_
OF SOME COMMON SPECIES (° F)
Preferred
Tolerated
Goldfish
55—65
35—95
,
_
Guppy
65—75
'
»
40-95 -
-
Angelfish
72—82
60—90
_
ln «artificial environments, because of the limitations of available
equipment, situations which require the application of heat to achieve
any required temperature are usually maintained at some more or”
Ï
less constant value, rather than being allowed to
over a
limited range in daily and seasonal cycles, as
in nature. Thisr-isparti:
cularly true today due to the use of electrical heating methods: ]
_
In former days, when gas and solid fuelboilers Were used—to he&t_
fish houses for instance, cycles could be arrahgedfætirlÿ. easily, and
in “fact often could not be avoided due to"thegreaterinuenceof
“{
ambient temperature on these; systems. This—, however,was probably
Ü
the only advantage of the old
it is d‘oub‘tful whether
this property was often exploited intentionally. The temperature
Of the environments in“which tropical fish are kept
main—,
‘
tained Within about 4°F (2°«G) —of the ‘chosen point.lt is possible,
by obtaining special equipment ‘or by
…
_
’
nally, and paying some-attention tothe situation
of the
to“ produce a differential of} onlyr 1°‘ÏF (0.50 C) but “this rsun—
"
is certainly of
benefit to the fish.“ '
‘
'
'
_:
The selected temperature should be «representative of
’
‘dayüme Surroundingsf i’n
environmeht durmgthe summer
period— of ”its,:ahnual
middle temperature
of 1 76°F
C)
'ï
.
;
with
from 74—78°F
—