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- Title
Plasma osmolarity, glucose concentration and erythrocyte responses of two Antarctic nototheniid fishes to acute and chronic thermal change.
- Authors
Lowe, C. J.; Davison, W.
- Abstract
Haematocrit, haemoglobin concentration, plasma osmolarity and plasma glucose concentration of the Antarctic nototheniid fishes Pagothenia borchgrevinki and Trematomus bernacchii were monitored during 24 h periods of exposure to 3 and 6° C. The same haematological variables were also measured in P. borchgrevinki following a 5–6 week period of 4° C acclimation. The first plasma glucose measurements in acutely thermally-stressed Antarctic nototheniids revealed a delayed hyperglycaemia which related well to the relatively slow stress-related elevation of plasma cortisol in these species. Plasma osmolarity of both species was unchanged by acute 3° C exposure, but exhibited a delayed and transient increase during acute exposure to 6° C. Haematocrit was unaltered in T. bernacchii during the acute temperature increases but was elevated in the relatively active P. borchgrevinki. Following 5–6 weeks of warm-acclimation (4° C) the plasma glucose concentration, haematocrit and haemoglobin concentration of P. borchgrevinki were not significantly different from fish at −1° C, but plasma osmolarity decreased toward the level found in temperate-water teleosts.
- Subjects
NOTOTHENIIDAE; FISHES; BLOOD plasma; ERYTHROCYTES; BLOOD sugar; HEMATOCRIT; HYPERGLYCEMIA; PHYSIOLOGICAL stress
- Publication
Journal of Fish Biology, 2005, Vol 67, Issue 3, p752
- ISSN
0022-1112
- Publication type
Article
- DOI
10.1111/j.0022-1112.2005.00775.x