Original Research

Energy loss via nonfaecal and faecal excretion in the marine elasmobranch Rhinobatos annulatus (Muller & Henle, 1841)

H. H. du Preez
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 9, No 3 | a463 | DOI: https://doi.org/10.4102/satnt.v9i3.463 | © 1990 H. H. du Preez | This work is licensed under CC Attribution 4.0
Submitted: 05 July 1990 | Published: 08 July 1990

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H. H. du Preez,, South Africa

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Abstract

The nonfaecal and faecal excretion of the sandshark Rhinobatos annulatus were investigated at 15° C and 20° C. Nonfaecal nitrogen excreted by starved and fed sandsharks consisted mainly of ammonia-N (60%) and urea-N (36%). Ammonia-N ex­cretion rates were temperature independent with the excretion rate of fed sandsharks significantly higher than those of starved sandsharks.

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