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FREE AMINO ACID AND INORGANIC ION REGULATION IN THE WHOLE MUSCLE AND HEMOLYMPH OF THE BLUE CRAB CALLINECTES SAPIDUS RATHBUN IN RELATION TO THE MOLTING CYCLE

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ABSTRACT Whole tissue inorganic ion and free amino acid (FAA) concentrations and hemolymph ion levels were measured at various stages in the molting cycle of Callinectes sapidus. Hemolymph [Mg2+] increased prior to ecdysis, but otherwise changes in blood ions and osmolality were insignificant. The tissue fluid volume decreased prior to molting and was accompanied by significant elevations in whole tissue K+ and Mg2+ concentrations. Total whole tissue FAAs decreased in premolt and remained low in postmolt. Certain FAAs increased at ecdysis (e.g., glutamic acid) while others declined (e.g., taurine). These changes are discussed in relation to ionoregulation, energy production, and synthetic processes.

Affiliations: 1: Department of Biology, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada; (present address) Department of Zoology, 223 Bartram Hall, University of Florida, Gainesville, Florida 32611.

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/content/journals/10.1163/1937240x85x00218
1985-01-01
2016-12-04

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