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Title: Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss) exposed to copper: Neurophysiological and histological effects on the olfactory system

Abstract

Olfactory epithelial structure and olfactory bulb neurophysiological responses were measured in chinook salmon and rainbow trout in response to 25 to 300 {micro}g copper (Cu)/L. Using confocal laser scanning microscopy, the number of olfactory receptors was significantly reduced in chinook salmon exposed to {ge}50 {micro}g Cu/L and in rainbow trout exposed to {ge}200 {micro}g cu/L for 1 h. The number of receptors was significantly reduced in both species following exposure to 25 {micro}g Cu/L for 4 h. Transmission electron microscopy of olfactory epithelial tissue indicated that the loss of receptors was from cellular necrosis. Olfactory bulk electroencephalogram (EEG) responses to 10{sup {minus}3} M L-serine were initially reduced by all Cu concentrations but were virtually eliminated in chinook salmon exposed to {ge}50 {micro}g Cu/L and in rainbow trout exposed to {ge}200 {micro}g Cu/L within 1 h of exposure. Following Cu exposure, EEG response recovery rates were slower in fish exposed to higher Cu concentrations. The higher sensitivity of the chinook salmon olfactory system to Cu-induced histological damage and neurophysiological impairment parallels the relative species sensitivity observed in behavioral avoidance experiments. This difference in species sensitivity may reduce the survival and reproductive potential of chinook salmon compared with that of rainbow troutmore » in Cu-contaminated waters.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Stratus Consulting, Boulder, CO (US)
OSTI Identifier:
20006629
Alternate Identifier(s):
OSTI ID: 20006629
Resource Type:
Journal Article
Journal Name:
Environmental Toxicology and Chemistry
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Other Information: PBD: Sep 1999; Journal ID: ISSN 0730-7268
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; WATER POLLUTION; BIOLOGICAL INDICATORS; COPPER; SALMON; TROUT; NERVOUS SYSTEM; OLFACTORY BULBS; GENETIC VARIABILITY

Citation Formats

Hansen, J.A., Rose, J.D., Jenkins, R.A., Gerow, K.G., and Bergman, H.L. Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss) exposed to copper: Neurophysiological and histological effects on the olfactory system. United States: N. p., 1999. Web. doi:10.1897/1551-5028(1999)018<1979:CSOTAR>2.3.CO;2.
Hansen, J.A., Rose, J.D., Jenkins, R.A., Gerow, K.G., & Bergman, H.L. Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss) exposed to copper: Neurophysiological and histological effects on the olfactory system. United States. doi:10.1897/1551-5028(1999)018<1979:CSOTAR>2.3.CO;2.
Hansen, J.A., Rose, J.D., Jenkins, R.A., Gerow, K.G., and Bergman, H.L. Wed . "Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss) exposed to copper: Neurophysiological and histological effects on the olfactory system". United States. doi:10.1897/1551-5028(1999)018<1979:CSOTAR>2.3.CO;2.
@article{osti_20006629,
title = {Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss) exposed to copper: Neurophysiological and histological effects on the olfactory system},
author = {Hansen, J.A. and Rose, J.D. and Jenkins, R.A. and Gerow, K.G. and Bergman, H.L.},
abstractNote = {Olfactory epithelial structure and olfactory bulb neurophysiological responses were measured in chinook salmon and rainbow trout in response to 25 to 300 {micro}g copper (Cu)/L. Using confocal laser scanning microscopy, the number of olfactory receptors was significantly reduced in chinook salmon exposed to {ge}50 {micro}g Cu/L and in rainbow trout exposed to {ge}200 {micro}g cu/L for 1 h. The number of receptors was significantly reduced in both species following exposure to 25 {micro}g Cu/L for 4 h. Transmission electron microscopy of olfactory epithelial tissue indicated that the loss of receptors was from cellular necrosis. Olfactory bulk electroencephalogram (EEG) responses to 10{sup {minus}3} M L-serine were initially reduced by all Cu concentrations but were virtually eliminated in chinook salmon exposed to {ge}50 {micro}g Cu/L and in rainbow trout exposed to {ge}200 {micro}g Cu/L within 1 h of exposure. Following Cu exposure, EEG response recovery rates were slower in fish exposed to higher Cu concentrations. The higher sensitivity of the chinook salmon olfactory system to Cu-induced histological damage and neurophysiological impairment parallels the relative species sensitivity observed in behavioral avoidance experiments. This difference in species sensitivity may reduce the survival and reproductive potential of chinook salmon compared with that of rainbow trout in Cu-contaminated waters.},
doi = {10.1897/1551-5028(1999)018<1979:CSOTAR>2.3.CO;2},
journal = {Environmental Toxicology and Chemistry},
issn = {0730-7268},
number = 9,
volume = 18,
place = {United States},
year = {1999},
month = {9}
}