Some Principles in the Thermal Requirements of Fishes Author(s): J. R. Brett Source: The Quarterly Review of Biology, Vol. 31, No. 2 (Jun., 1956), pp. 75-87 Published by: The University of Chicago Press Stable URL: http://www.jstor.org/stable/2815121 Accessed: 06/02/2009 12:41 Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your personal, non-commercial use. Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained at http://www.jstor.org/action/showPublisher?publisherCode=ucpress . Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. JSTOR is a not-for-profit organization founded in 1995 to build trusted digital archives for scholarship. We work with the scholarly community to preserve their work and the materials they rely upon, and to build a common research platform that promotes the discovery and use of these resources. For more information about JSTOR, please contact [email protected]. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Quarterly Review of Biology. http://www.jstor.org
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Some Principles in the Thermal Requirements of FishesAuthor(s): J. R. BrettSource: The Quarterly Review of Biology, Vol. 31, No. 2 (Jun., 1956), pp. 75-87Published by: The University of Chicago PressStable URL: http://www.jstor.org/stable/2815121
Accessed: 06/02/2009 12:41
Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at
http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unless
you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and youmay use content in the JSTOR archive only for your personal, non-commercial use.
Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained at
Fabricius (1950) to release spawning activities in
the pike (Esox), whereas the whitefish (Coregonus)
require a lowering of water temperature with a
particular character of bottom.
Thus it would seem that an inherent ability to
perceive fine gradients of temperature is only
exercisedwhen called upon by some internal drive
(possibly in some migrations) or by an environ-
mental stress (possibly at higher temperatures).
This would constitute a distinction between tem-
perature as a directive factor and temperature as
a preferendum. The preferred temperature does
not exert such a "pressure" eliciting particular
activities, but has a wider range of effectiveness
governing the efficiencyof performanceof the fish.
SUMMARY
Among aquatic gill-respiring vertebrates there
is no escape from environmental temperature.
Tissue temperature and environmental tempera-
ture are constantly equilibratedat the gill surfaces.
Although the thermal requirements for fish
have been seen to fall in a number of categories,
the fundamental requirement can be restated-an
external temperature best suited to the internal
tissues. The tissues themselves are functionallyadapted to a wide thermal tolerance, which is
bounded by lethal limits and shows great diversity
between species.
In general, cold-water fishes have a lower level
of thermal tolerance than inhabitants of warmer
waters.
Through reversible acclimation, which is more
rapid for a rising temperature than for a falling
temperature, the degree of tolerance and the
activity range is variously extended among species.
A slow rate of decrease n environmental tempera-
ture is of greater importance for maintaining life
than a slow rate of increase.
The combined information concerning lethal
temperature and temperature permitting maxi-
mum activity, at all stages of development, is
necessary for an interpretation of temperature in
terms of survival value. Where high temperature
does not limit activity, lethal levels can be ex-
pected to be a prominent environmental factor in
setting the limits of distribution.
The scope for activity of cold-water fishes finds
maximum expression at moderately low tempera-
tures, which appear to be those frequented by the
fish as preferredtemperatures.
A potential for delicate discrimination of tem-
perature differences among diverse species of fish
is probably only exercised under particular en-
vironmental conditions.
Temperature, then, may act in the capacity of a
lethal factor; it constantly conditions the fish
through acclimation while governing the scope for
metabolic rate; performance is best in the region
of the preferred temperature; and a sensitivity to
small gradients of temperaturemay act as a direc-tive factor. Undoubtedly, the role of temperature
among fish is a multiple one.
ACKNOWLEDGMENT
As in earliereffortswhileinvestigating he influenceof temperature n fish, the constructivecriticismandencouragementf Dr. F. E. J. Fry have providedaninvaluablestimulus.His editing of this manuscript sparticularly ppreciated.
LIST OF LITERATURE
BAILEY, R. M. 1955. Differential mortality from
high temperature in a mixed population of fishes
in southern Michigan. Ecology, 36: 526-528.
BALDWIN, E. 1948. An Introduction to Comparative
Biochemistry. 164 pp. Cambridge, at the Uni-
versity Press.
BATTLE, H. I. 1926. Effects of extreme tempera-
tures on muscle and nerve tissue in marine fishes.