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- Title
The impact of acute salinity exposure and temperature on the survival, osmoregulation, and hematology of juvenile shortnose sturgeon (Acipenser brevirostrum).
- Authors
Downie, Adam T.; Wallace, Hannah; Taylor, Samantha; Kieffer, James D.
- Abstract
Juvenile shortnose sturgeon (Acipenser brevirostrum Lesueur, 1818) were exposed to seawater and freshwater for 24 h to evaluate the osmoregulatory capabilities over a seasonal temperature gradient (5, 10, 15, 20 °C). Additionally, juveniles were exposed to 5 °C seawater and freshwater over 72 h to evaluate survival and osmoregulatory capacity under cold water conditions. Osmoregulatory capability was evaluated using standard metrics: survival rate, mass loss, plasma chloride ion (Cl–) concentrations, osmolality, oxygen-carrying variables, and energy metabolites. Three mortalities occurred following 24 h exposure to 20 °C seawater (73% survival) and one mortality occurred within 72 h in 5 °C seawater (89% survival). Plasma Cl– concentrations and osmolality were elevated in seawater-exposed juveniles at every exposure time, regardless of temperature. The least mass was lost in juveniles exposed to 5 and 10 °C seawater, versus 15 and 20 °C seawater. Low mass loss is likely due to a lower metabolic rate and lower ventilation, which would slow the rate by which osmotic stress would occur under cold conditions.
- Subjects
SHORTNOSE sturgeon; EFFECT of salt on fishes; OSMOREGULATION; EFFECT of temperature on fishes; ANIMAL young; VETERINARY hematology; FISH metabolism; FISHES
- Publication
Canadian Journal of Zoology, 2018, Vol 96, Issue 8, p913
- ISSN
0008-4301
- Publication type
Article
- DOI
10.1139/cjz-2017-0149