Respiration rates and ATP concentrations in the excised gills of the blue crab as a function of salinity*

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Abstract

  • 1.

    The respiration rates and ATP contents of the excised gills of the blue crab, Callinectes sapidus, were determined at salinities of 5 and 35s%.

  • 2.

    Respiration rate was significantly higher at 5 than at 35 and there was virtually no anterior (gills 1–5), posterior (gills 6–8) difference in respiration rate.

  • 3.

    Acclimation salinity also was shown to have little effect on respiration rate of the gill tissue when tested at 5 and 35.

  • 4.

    The respiration rates and ATP contents of the individual gills were shown to be directly dependent upon the salinity of the medium.

  • 5.

    Respiration rate and ATP content of gill tissue was directly related to the size of the gill, and ATP content was inversely related to respiration rate of the tissue.

  • 6.

    These data indicate that when crab gill tissue is subjected to osmotic stress, the process of cellular accommodation is an energetic process and that the ultimate source of energy is ATP.

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*

This research was supported under a co-operative agreement between the National Marine Fisheries Service and the U.S. Atomic Energy Commission.

Present address: School of Medicine, University of North Carolina, Chapel Hill, NC 27514, U.S.A.

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