Thumbnail Image
Publication

Temperature, hypoxia, and mycobacteriosis: effects on adult striped bass Morone saxatilis metabolic performance

Lapointe, D
; 
Vogelbein, Wolfgang K.
; 
Fabrizio, Mary C
; 
Gauthier, Debra J.
; 
Brill, Richard
Abstract
Mycobacteriosis, a chronic bacterial disease of fishes, is prevalent in adult striped bass from Chesapeake Bay (USA). Although environmental factors may play a role in disease expression, the interaction between the disease and environmental stress remains unexplored. We therefore examined the individual and interactive effects of elevated temperature, hypoxia, and mycobacteriosis on the metabolism of wild-caught adult striped bass from Chesapeake Bay using respirometry. Because the spleen is the primary target organ of mycobacteriosis in striped bass, we hypothesized that the disease interferes with the ability of fish to increase their hemato crit in the face of increasing oxygen demands. We determined standard metabolic rate (SMR), maximum metabolic rate under normoxia (MMRN), critical oxygen saturation (S-crit), and MMR under hypoxia (3 mg O-2 l(-1): MMRH) for healthy and visibly diseased fish (i.e. exhibiting skin lesions indicative of mycobacteriosis). Measurements were taken at a temperature within the preferred thermal range (20 degrees C) and at an elevated temperature (28 degrees C) considered stressful to striped bass. In addition, we calculated aerobic scope (AS(N) = MMRN - SMR, AS(H) = MMRH - SMR) and factorial scope (FSN = MMRN SMR-1, FSH = MMRH SMR-1). SMR increased with increasing temperature, and hypoxia reduced MMR, AS, and FS. Mycobacteriosis alone did not affect either MMRN or MMRH. However, elevated temperature affected the ability of diseased striped bass to tolerate hypoxia (S-crit). Overall, our data indicate that striped bass performance under hypoxia is impaired, and that elevated water temperatures, hypoxia, and severe mycobacteriosis together reduce aerobic scope more than any of these stressors acting alone. We conclude that the scope for activity of diseased striped bass in warm hypoxic waters is significantly compromised.
Description
Date
2014-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
Collections
Publications, Presentations, & Events
Show all metadata
Download Dataset
Files
Thumbnail Image
d108p113.pdf
Adobe PDF, 2.07 MB
Rights Holder
Usage License
Embargo
Research Projects
Organizational Units
Journal Issue
Keywords
Fisheries Science Peer-Reviewed Articles, Critical Oxygen-Tension; Cod Gadus-Morhua; Chesapeake Bay; Atlantic Cod; Swimming Performance; Dissolved-Oxygen; Climate-Change; Rainbow-Trout; Adenosine-Triphosphatase; Speculative Hypothesis
Citation
Advisor
Department
Virginia Institute of Marine Science
DOI
https://doi.org/10.3354/dao02693
URI
https://scholarworks.wm.edu/handle/internal/19018
Embedded videos