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Reprodctive biology of trout in a thermally enriched environment: the Firehole River of Yellowstone National Park. Second annual progress report, April 1, 1974--June 30, 1976

Technical Report ·
OSTI ID:7265240
Temperature recordings indicate that trout inhabiting the warmest section of the river live at temperatures averaging 11.5 C higher than those inhabiting the upstream, cold-water section above most of the thermal discharges. Daily maximum temperatures during summer occasionally exceed published lethal levels for trout, and daily means consistently exceed the 20/sup 0/C upper limit considered favorable for growth. Brown trout at the cold-water station show a normal reproductive pattern and spawn in the late fall. Brown trout at the warmest water station show a similar seasonal pattern; however about half of the specimens examined were either not maturing or were undergoing massive atresia of ova. Rainbow trout also have a similar reproductive pattern and spawn in late fall, in contrast to the normal spring and early summer spawning period of this species. Both species grow considerably faster at the warm-water stations than they do at the cold-water stations, despite having their growth inhibited by high summer temperatures. Differences in diet are evident. Trout captured from both warm and cold areas have internal body temperatures closely similar to water temperatures, and thus provide no evidence for the existence of cooler microhabitats within the general stream.
Research Organization:
Montana State Univ., Bozeman (USA)
OSTI ID:
7265240
Report Number(s):
RLO-2228-T2-2
Country of Publication:
United States
Language:
English

Similar Records

Reproductive biology of trout in a thermally enriched environment: the Firehole River of Yellowstone National Park. Final report, April 1974--June 30, 1978
Technical Report · Fri Jun 30 00:00:00 EDT 1978 · OSTI ID:6892999
Reproductive biology of rainbow and brown trout in a geothermally heated stream: the Firehole River of Yellowstone National Park
Journal Article · Fri Jul 01 00:00:00 EDT 1977 · Trans. Am. Fish. Soc.; (United States) · OSTI ID:5369380
Growth and diets of trout from contrasting environments in a geothermally heated stream: the Firehole River of Yellowstone National Park
Journal Article · Sat Dec 31 23:00:00 EST 1977 · Trans. Am. Fish. Soc.; (United States) · OSTI ID:5759538

Related Subjects

520400 -- Environment
Aquatic-- Thermal Effluents Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560205* -- Thermal Effects-- Vertebrates-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
AQUATIC ORGANISMS
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
DIET
FISHES
GEYSERS
HOT SPRINGS
NATURAL OCCURRENCE
PHYSIOLOGY
POLLUTION
PUBLIC LANDS
REPRODUCTION
TEMPERATURE EFFECTS
THERMAL EFFLUENTS
THERMAL POLLUTION
THERMAL SPRINGS
TROUT
VERTEBRATES
WATER POLLUTION
YELLOWSTONE NATIONAL PARK