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Journal of Fish Biology (2002) 60, 15801590 doi:10.1006/jfbi.2002.2023, available online at http://www.idealibrary.com on
 

Summary: Journal of Fish Biology (2002) 60, 15801590
doi:10.1006/jfbi.2002.2023, available online at http://www.idealibrary.com on
Changes in chloride secretion rate and vascular perfusion in
the rectal gland of the European lesser-spotted dogfish in
response to environmental and hormonal stimuli
W. G. ANDERSON*, J. P. GOOD AND N. HAZON
School of Biology, Division of Environmental and Evolutionary Biology,
Gatty Marine Laboratory, University of St Andrews, St Andrews,
Fife KY16 8LB, U.K.
(Received 25 October 2001, Accepted 27 May 2002)
Chloride secretion rates of rectal glands taken from the European lesser-spotted dogfish
Scyliorhinus canicula adapting to 70% and 120% sea water (SW) were significantly greater and
less than, respectively, those in the control 100% SW group. C-type natriuretic peptide (CNP)
significantly increased chloride secretion rates above basal values in 100% SW although
angiotenisn II (ANG II) had no effect. Perfusion of the secretory epithelia in rectal glands from
70% SW lesser-spotted dogfish was significantly higher than in rectal glands from 100% and
120% SW lesser-spotted dogfish. Perfusion of rectal glands with ANG II had no effect on
perfusion of the secretory epithelia, although CNP perfusion induced significantly greater
perfusion of the secretory epithelia than all other treatments. It remains to be determined if a
reduction in environmental salinity induces an increase in plasma concentration of CNP and

  

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

 

Collections: Biology and Medicine