How is this for info ? FYI 37C = 98.6F.
http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=91120&fpart=1Transactions of the American Fisheries Society 109:617-625, 1980
Effects of Elevated Temperature on Growth and
Survival of Smallmouth Bass
WILLIAM B. WRENN
Considering that the minimum temperature
was 35 C on 9 days, I concluded that the
lethal limit was greater than 35 C and that it
was probably as high as 37 C. Other studies
support the second conclusions L.arimore and Duever
(1968) reported an upper lethal temperature
of 38 C for smallmouth bass fry, and, basing
their results on laboratory temperature-avoidance experiments and field observations S, tauffer
et al. reported that smallmouth bass could
tolerate 35 C. An upper incipient lethal temperature f
or smallmouth bass, as classically de -
fined (see Brungs and Jones 1977), was not
found in the literature The lethal temperature
of 35 C reported by Cherry et al. (1977) was
derived on the basis of a single death during a
7-day exposure period. This value (35 C) was
used as a reference level In the present study
because it was the highest lethal temperature
reported for juvenile or adult smallmouth bass.....
As a result of the growth and survival of
smallmouth bass in the present study , we found
that the temperature tolerance of this species
is quite broad, which is typical of a warmwater
species. According to the proposed temperature
classification for freshwater fish by Hokanson(
1977), smallmouth bass more closely fits
the category of a temperature theme: species
(including largemouth bass and carp, Cyprinus
carpio) that have an ultimate incipient lethal
The juvenile category
is qualified at this point because the fish were
age 0 at the start of the study, yet unexpectedly
reproduced within the following year. The
study was conducted in 12 temperature- controlled
outdoor channels located on the Tennessee
River in Alabama which is the southern
limit of the native range for smallmouth bass.
Bill Noted
Bill Cody
Lunker
Registered: April 18, 2002
Posts: 3924
Loc: Malinta OH
(64.31.90.50) Readers, keep in mind that the data Ewest provided above (July 11th post) are from laboratory stuides and they did not involve: 1. hooking from angling, 2. bleeding from angling, and 3. stressful excercise to exhaustion causing intense lactic acid buildup in mussle tissue. I think those factors will significantly lower the upper lethal temparature limit for SMB.
_________________________
Smallmouth Bass Reproduction in Elevated Temperature Regimes at the Species' Native Southern Limit
WILLIAM B. WRENN
Tennessee Valley Authority, Division of Air and Water Resources, Knoxville, Tennessee
Abstract.—The effects of elevated temperatures on reproduction of smallmouth bass Micropterus dolomieui were evaluated in large outdoor channels (112 m long; 0.05 hectare) on the Tennessee River in Alabama, the southern limit of the species' native range. Replicated treatments were the ambient temperature of the Tennessee River and 3, 6, and 9 C above ambient (December 1978-October 1979). Peak egg deposition was advanced about 8 days per 3 C increase over ambient but occurred at temperatures (18-22 C) within the normal range reported for spawning by this species (15-26 C). Peak spawning time ranged from March 22 in the +9 C treatment to April 16 in the ambient regime. Duration of spawning periods (11 to 19 days) in the four temperature treatments was similar to those reported for natural populations. Survival rates from egg deposition to emergence from the nest were about 90% in all treatments. A maximum weekly average temperature of 26 C during the spawning season will allow survival of smallmouth bass eggs and larvae. This study indicated that the southern limit of the original range of smallmouth bass was not determined by the influence of temperature on reproduction and that above-normal temperatures would not affect reproduction and recruitment to the extent that low temperatures affect northernmost populations.
Received April 9, 1983 Accepted March 19, 1984
DOI: 10.1577/1548-8659(1984)113<295:SBRIET>2.0.CO;2
Transactions of the American Fisheries Society 1984;113:295–303