Electrolyte changes,cell volume regulation and hormonal influences during acclimation of rainbow trout (Salmo gairdnerii) to salt water |
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| Affiliation: | 1. TNJFU Institute of Fisheries Post Graduate Studies, OMR Campus, Chennai, India;2. Division of Fish Genetics and Biotechnology, Faculty of Fisheries, Rangil Ganderbal- SKUAST-Kashmir, India;1. Department of Spine Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan, People''s Republic of China;2. Department of Emergency Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan, People''s Republic of China;3. Emergency Medicine and Difficult Diseases Institute, Second Xiangya Hospital, Central South University, Changsha, Hunan, People''s Republic of China;4. Department of Nephrology, Second Xiangya Hospital, Central South University, Changsha, Hunan, People''s Republic of China;1. Department of Natural Sciences, Hawai''i Pacific University, Kāne''ohe, HI 96744, USA;2. Hawai''i Institute of Marine Biology, University of Hawai''i, Kāne''ohe, HI 96744, USA;3. University of Hawai''i Sea Grant College Program, University of Hawai''i, Honolulu, HI 96822, USA |
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| Abstract: | - 1.1. Rainbow trout were acclimated to salt water (1.5, 2.0 or 3.0%, which means 40, 60 or 85% concentrated sea-water) and the electrolyte, glucose and cortisol concentrations of the plasma as well as the extra- and intracellular muscle space, the muscle electrolyte concentrations and the ATPase activity were analysed.
- 2.2. Plasma osmolality, Na+, Ca2+ and Mg2+ concentrations of the plasma had a maximum at 24 hr after the start of acclimation when acclimated to 3.0% salt water. Plasma osmolality, Na+ and Mg2+ concentrations were significantly higher during the whole acclimation time when exposed to 3.0% salt water.
- 3.3. Variations and regulations of ECS and ICS were clearly demonstrated. The intracellular electrolyte concentrations were also maximal at 24 hr.
- 4.4. The plasma glucose level was just slightly elevated, but the cortisol level clearly indicated a stress response at 24 hr.
- 5.5. The activity of gill Na-K-ATPase increased during the acclimation time.
- 6.6. The regulatory processes in trout during acclimation to salt water are compared with those occurring in tilapia and carp.
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