Journal article
Pseudobranch and gill Na +, K +-ATPase activity in juvenile chinook salmon, Oncorhynchus tshawytscha: developmental changes and effects of growth hormone, cortisol and seawater transfer
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, Vol.135(2), pp.249-262
2003
Handle:
https://hdl.handle.net/2376/110404
PMID: 12781825
Abstract
The teleost pseudobranch is a gill-like structure often fused to the anterior of the opercular cavity. Pseudobranch cells are mitochondria rich and have high levels of Na
+, K
+-ATPase activity. In this study, pseudobranch Na
+, K
+-ATPase activity in juvenile chinook salmon (
Oncorhynchus tshawytscha) was compared to gill Na
+, K
+-ATPase activity, a known marker of parr–smolt transformation, in three experiments. In two stocks of New Zealand chinook salmon, pseudobranch Na
+, K
+-ATPase activity was found to significantly increase during development. At these times gill Na
+, K
+-ATPase activity was also elevated. Pseudobranch Na
+, K
+-ATPase activity did not increase 10 days after transfer from fresh water to 34 ppt seawater, a treatment that resulted in a twofold increase in gill Na
+, K
+-ATPase activity. Cortisol (50 μg/g) and ovine growth hormone (5 μg/g) implants had no effect on pseudobranch Na
+, K
+-ATPase activity in underyearling chinook salmon, while gill Na
+, K
+-ATPase activity was stimulated by each hormone. In yearling chinook salmon, only cortisol stimulated pseudobranch Na
+, K
+-ATPase activity 14 days post-implantation. It was concluded that the pseudobranch differs from the gill in terms of the regulation of Na
+, K
+-ATPase activity and a role during adaptation to seawater is likely to be limited.
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Details
- Title
- Pseudobranch and gill Na +, K +-ATPase activity in juvenile chinook salmon, Oncorhynchus tshawytscha: developmental changes and effects of growth hormone, cortisol and seawater transfer
- Creators
- Michael C.J Quinn - Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New ZealandPhilip A Veillette - Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New ZealandGraham Young - Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New Zealand
- Publication Details
- Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, Vol.135(2), pp.249-262
- Academic Unit
- UNKNOWN
- Publisher
- Elsevier Inc
- Identifiers
- 99900547574901842
- Language
- English
- Resource Type
- Journal article