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Investigating The Salinity Tolerance Of The Swordtail (Xiphophorus Hellerii), Alexandra Megan Krak
Investigating The Salinity Tolerance Of The Swordtail (Xiphophorus Hellerii), Alexandra Megan Krak
College of Science and Health Theses and Dissertations
The swordtail, Xiphophorus hellerii, is a freshwater fish species native to Mexico and Central America and is commonly used in the tropical aquarium trade. Swordtails have been shown to have limited survival in 6 ‰ salinity (Nanda et al., 2016), suggesting they may have a greater salinity tolerance than previously expected. Using a gradual acclimation method, we examined the salinity tolerance and swim performance of this species. Freshwater-reared female swordtails were housed in 29-gallon aquaria. A control group was held in freshwater throughout the experiment. For the experimental group, the salinity was increased by 2 ‰ every week until 30 …
Na+/K+-Atpase Isoform Regulation In Three-Spine Stickleback (Gasterosteus Aculeatus) During Salinity Acclimation, Shelby Judd
Na+/K+-Atpase Isoform Regulation In Three-Spine Stickleback (Gasterosteus Aculeatus) During Salinity Acclimation, Shelby Judd
College of Science and Health Theses and Dissertations
Most marine and all freshwater fishes regulate the ionic and osmotic composition of their extracellular fluids different from the outside environment. The gills play a prominent osmoregulatory role in maintaining whole body ion and water balance in fish living in both freshwater and saltwater environments. The ability of the gill to regulate salts is dependent on the action of the Na+/K+-ATPase. When euryhaline fishes, fishes able to tolerate changes in external salinity, experience changes in environmental salinity, they alter their gill physiology and Na+/K+-ATPase activity to handle changing osmotic and ionic stresses. …