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Rectal gland morphology of freshwater and seawater acclimated bull sharks Carcharhinus leucas
 

Summary: Rectal gland morphology of freshwater and seawater
acclimated bull sharks Carcharhinus leucas
R. D. PILLANS*, J. P. GOOD, W. G. ANDERSON§, N. HAZON
AND C. E. FRANKLIN*
*School of Integrative Biology, The University of Queensland, Brisbane, QLD 4072,
Australia, Department of Biology, Division of Environmental and Evolutionary Biology,
Gatty Marine Laboratory, University of St Andrews, St Andrews, Fife, KY16 8LB,
Scotland, U.K. and §Department of Biological Sciences, University of Manitoba,
Winnipeg, MB R3T 2N2 Canada
(Received 2 April 2007, Accepted 9 November 2007)
To compare rectal gland morphology of bull sharks Carcharhinus leucas, animals captured in
the freshwater reaches of the Brisbane River, Australia, were acclimated to sea water over 17
days with 1 week in the final salinity. A control group was left in fresh water for 17 days.
Animals in fresh water and sea water were strongly hyper- and hypo-ionic with respect to
plasma Naş
and Cl­
, respectively. This difference necessitates NaCl secretion by the rectal gland
in sea water and conservation of NaCl in fresh water. Structural differences in the rectal gland
of freshwater and seawater acclimated bull sharks were limited. There was no difference in rectal
gland cross-sectional area, lumen area, rectal gland vein area, number of secretory tubules or

  

Source: Anderson, W. Gary - Department of Biological Sciences, University of Manitoba

 

Collections: Biology and Medicine