Stress response in the Antarctic teleosts ( Notothenia neglecta Nybelin and N. rossii Richardson)
Blood chemistry and haematological parameters have been determined in the Antarctic teleosts, Notothenia neglecta Nybelin and Notothenia rossii Richardson at 2° C. Samples were taken using chronically implanted dorsal aortic cannulae following a minimum of 24–36 h recovery. Broadly similar results w...
| Published in: | Journal of Fish Biology |
|---|---|
| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1991
|
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1991.tb03108.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1991.tb03108.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1991.tb03108.x |
| Summary: | Blood chemistry and haematological parameters have been determined in the Antarctic teleosts, Notothenia neglecta Nybelin and Notothenia rossii Richardson at 2° C. Samples were taken using chronically implanted dorsal aortic cannulae following a minimum of 24–36 h recovery. Broadly similar results were obtained for the two species. In N. neglecta , routinely active specimens had high values of arterial pH (7.81) and PO 2 (9.26 kPa), and modest haemoglobin levels (5.6 g dl −1 ) relative to temperate species. Following 3 min strenuous activity there was a decrease in arterial pH (7.63) and a small rise in lactate from 0.41 to 0.68 mm, but no significant change in the calculated net metabolic acid load (δH m +). PaO 2 and PaCO 2 varied inversely during exercise, and oxygen content declined by 22%. pHa and most other haematological parameters returned to routine values between 1–3 h post‐exercise. The results suggest that the major effect of strenuous activity in Notothenia spp. is a respiratory, rather than a metabolic acidosis. |
|---|