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Journal of Experimental Biology 70,221-230 (1977)
Published by Company of Biologists 1977

Salt and Water Balance of the Spiny Lobster, Panulirus Argus: The Role of the Antennal Glands

D. F. MALLEY 1

1 Department of Zoology, University of Michigan, Arm Arbor, Michigan 48109, U.S.A.

1. Panulirus argus in full sea water differs from most other marine isosmotic decapods by regulating Cl- levels in the haemolymph slightly below those in sea water and by having haemolymph K+ levels similar to those in sea water. The species is typical in regulating haemolymph Na+ and Ca2+ above, and Mg2+ and SO42- below, sea-water levels of these ions. Its haemolymph Mg2+ and SO42- concentrations are amongst the lowest reported in marine decapods.

2. The antennal glands contribute to this regulation of Mg2+ SO42- and Cl- by producing urine with markedly, and approximately equally, elevated Mg2+ and SO42- levels, and slightly elevated Cl- levels, compared with those in the haemolymph. The antennal glands show a small tendency to conserve water.

Note:

Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6.

Submitted on March 22, 1977






© The Company of Biologists Ltd 1977