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Osmoregulation in elephant fish, CALLORHYNCHUS MILLII (HOLOCEPHALI)

Hyodo, S., Kawakoshi, A., Bell, J., Donald, J., Takei, Y. and Toop, T. 2005, Osmoregulation in elephant fish, CALLORHYNCHUS MILLII (HOLOCEPHALI), in The Proceedings of the 15th International Congress of Comparative Endocrinology, International Congress of Comparative Endocrinology, New York, N.Y., pp. 77-77, doi: 10.1002/jez.a.271.

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Title Osmoregulation in elephant fish, CALLORHYNCHUS MILLII (HOLOCEPHALI)
Author(s) Hyodo, S.
Kawakoshi, A.
Bell, J.
Donald, J.ORCID iD for Donald, J. orcid.org/0000-0001-5930-2642
Takei, Y.
Toop, T.
Conference name International Congress of Comparative Endocrinology (15th : 2005 : Boston, Mass.)
Conference location Boston, Mass.
Conference dates 22-27 May 2005
Title of proceedings The Proceedings of the 15th International Congress of Comparative Endocrinology
Editor(s) Callard, I. P.
Publication date 2005
Start page 77
End page 77
Publisher International Congress of Comparative Endocrinology
Place of publication New York, N.Y.
Summary Osmoregulatory mechanisms in holocephalan fishes are unknown except that they conduct urea-based osmoregulation as in elasmobranchs. We, therefore, examined changes in plasma parameters of elephant fish, Callorhynchus millii, after gradual transfer to concentrated (120%) or diluted (80%) seawater (SW). In control fish, plasma Na and urea concentrations were about 300mM and 450mM, respectively. These values were equivalent to those of sharks and rays, but the plasma urea concentration of elephant fish was considerably higher than that reported for chimaeras, another holocephalan. After transfer to 120% SW, the plasma Na concentration markedly increased, while a conspicuous decrease in plasmaurea concentration was observed following transfer to 80% SW. In elephant fish, we could not find a discrete rectal gland. Instead, approximately 10 tubular structures were located in the wall of post-valvular intestine. Each tubular structure was composed of a putative salt-secreting component consisting of a single-layered columnar epithelium, which was stained with anti-Na+,K±ATPase serum. It is most likely that the tubular structures in the posterior intestine represent a primitive form of the rectal gland in elephant fish. In addition, we have identified two C-type natriuretic peptides (CNPs) from the heart and brain of elephant fish, which may contribute to the control of NaCl excretion from the rectal gland of elephant fish as it does in elasmobranchs.
Language eng
DOI 10.1002/jez.a.271
Field of Research 060604 Comparative Physiology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category E3.1 Extract of paper
Persistent URL http://hdl.handle.net/10536/DRO/DU:30014489

Document type: Conference Paper
Collection: School of Biological and Chemical Sciences
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