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Salt and Water Balance of the Spiny Lobster Panulirus Argus: The Role of the Gut
1 Department of Zoology, University of Michigan, Arm Arbor, Michigan 48109, U.S.A.
1. The rate of drinking of sea water averaged 1.5 ± 0.6 ml/kg body weight per 24 h and accounts for only a minor portion of the uptake of water required to balance estimated urine production.
2. Imbibed water and ions, except Ca2+, are absorbed or diffuse across the gut wall into the haemolymph. The gut appears to be a route of net loss of Ca2+, derived from digestive juice and sea water, from the body.
3. The gut does not appear to be a site of regulation of ionic levels in the haemolymph or a major site of water uptake.
Note:
Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6.
Submitted on March 22, 1977
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