Freshwater to seawater acclimation of juvenile bull sharks (Carcharhinus leucas): plasma osmolytes and Na+/K+-ATPase activity in gill, rectal gland, kidney and intestine

@article{Pillans2004FreshwaterTS,
  title={Freshwater to seawater acclimation of juvenile bull sharks (Carcharhinus leucas): plasma osmolytes and Na+/K+-ATPase activity in gill, rectal gland, kidney and intestine},
  author={Richard D. Pillans and Jonathan P. Good and W. Gary Anderson and Neil Hazon and Craig E. Franklin},
  journal={Journal of Comparative Physiology B},
  year={2004},
  volume={175},
  pages={37-44}
}
This study examined the osmoregulatory status of the euryhaline elasmobranch Carcharhinus leucas acclimated to freshwater (FW) and seawater (SW). Juvenile C. leucas captured in FW (3 mOsm l−1 kg−1) were acclimated to SW (980–1,000 mOsm l−1 kg−1) over 16 days. A FW group was maintained in captivity over a similar time period. In FW, bull sharks were hyper-osmotic regulators, having a plasma osmolarity of 595 mOsm l−1 kg−1. In SW, bull sharks had significantly higher plasma osmolarities (940 mOsm… 
Branchial osmoregulation in the euryhaline bull shark, Carcharhinus leucas: a molecular analysis of ion transporters
TLDR
Assessment of branchial ion and acid-base regulatory mechanisms of C. leucas suggests that NHE3 and NKA together may be important in mediating branchial Na+ uptake in freshwater environments, whereas PDN and VHA might contribute to Cl-/HCO3- transport in marine and freshwater bull shark gills.
Comprehensive analysis of genes contributing to euryhalinity in the bull shark, Carcharhinus leucas; Na+-Cl− co-transporter is one of the key renal factors upregulated in acclimation to low-salinity environment
TLDR
The salinity transfer experiment combined with a comprehensive gene screening approach demonstrates that NCC is a key renal protein that contributes to the remarkable euryhaline ability of the bull shark.
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Osmoregulation in elasmobranchs: a review for fish biologists, behaviourists and ecologists
TLDR
A broad review of osmoregulation in elasmobranchs for non-specialists, focusing on recent advances, is provided, highlighting the contribution of drinking and eating processes in maintaining osmotic consistency.
Rectal gland morphology of freshwater and seawater acclimated bull sharks Carcharhinus leucas
TLDR
Differences in rectal gland morphology of bull sharks in fresh water and sea water are discussed in terms of their relevance to osmoregulation in elasmobranchs.
Physiological responses to hypersalinity correspond to nursery ground usage in two inshore shark species (Mustelus antarcticus and Galeorhinus galeus)
TLDR
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Na+/K+-ATPase α1 mRNA expression in the gill and rectal gland of the Atlantic stingray, Dasyatis sabina, following acclimation to increased salinity
TLDR
Regulation of atp1a1 in the elasmobranch salt-secreting gland in response to salinity acclimation and a negative relationship between rectal gland and gill atp 1a1 expression support the hypothesis that the gill and rectal glands play opposing roles in ion balance with the gills potentially facilitating ion uptake in hypoosmotic environments.
Comparison of the osmoregulatory capabilities among three amphibious sea snakes (Laticauda spp.) in Taiwan
TLDR
This study suggests that the NKA activity of the sublingual gland is associated with salt excretion, and the three species possess different osmoregulatory strategies which are associated with their habitat affinities.
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TLDR
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Since the discovery of the phenomenally high urea content of the body fluids of cartilaginous fishes by Staedeler and Frerichs (1858), the unique osmoregulatory system of this vertebrate class has
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TLDR
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