Re: NANFA-- heat-tolerant sculpins

Dave Neely (
Fri, 27 Jul 2001 12:56:56 -0500


Steve Walsh et al. (1997) examined the thermal tolerance and metabolism of
several sculpin taxa from the SE US.

Sculpins were held at stepped acclimation temperatures of 10, 15, 20, and 25
deg C for between 2-72 weeks, then tested for critical thermal maxima
(defined as the temp at which fish would not right themselves after being
flipped over), and metabolic rates.

They did not find intraspecific differences in thermal tolerance between
Tallapoosa sculpin, banded sculpin, Ozark sculpins, or "mottled sculpin"
(they used "smoky sculpins" from the upper Etowah). Pygmy sculpins and
mottled sculpins had lower critical thermal maxima than all other taxa
examined. All species examined exhibited significant differences in
temperature tolerance across acclimation temperatures, suggesting that
localized populations which are used to high temps would be more able to
withstand such conditions in aquaria.

The complete citation for those interested parties is:
Walsh, SJ, DC Haney, and CM Timmerman. 1997. Variation in thermal tolerance
and routine metabolism among spring and stream-dwelling freshwater sculpins
(Teleostei: Cottidae) of the southeastern United States. Ecology of
Freshwater Fish 1997(6):84-94.


Get your FREE download of MSN Explorer at

/"Unless stated otherwise, comments made on this list do not necessarily
/ reflect the beliefs or goals of the North American Native Fishes
/ Association"
/ This is the discussion list of the North American Native Fishes Association
/ To subscribe, unsubscribe, or get help, send the word
/ subscribe, unsubscribe, or help in the body (not subject) of an email to
/ For a digest version, send the command to
/ instead.
/ For more information about NANFA, visit our web page,