The Journal of experimental zoology

Early increase of a salt-regulating enzyme in blue crab gills during low-salinity adjustment happens without changes in a related enzyme

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Abstract

CA induction in the gills of the blue crab, Callinectes sapidus, began within 24 hours of lowered salinity exposure.

  • Induction of carbonic anhydrase (CA) in the seventh gill pair increased with decreasing ambient salinity.
  • Activity in the third gill pair remained unchanged despite salinity changes.
  • The peak of CA induction occurred four days after exposure to low salinity.
  • Total ninhydrin-positive substances appeared in the hemolymph within 4 hours of low salinity transfer, indicating a cell volume regulatory response.
  • Ornithine decarboxylase (ODC) activity did not significantly change in gills of crabs acclimated to 35 ppt salinity.
  • A transient increase in ODC activity was observed in all tissues of crabs transferred from 28 ppt to 15 ppt, but this increase does not seem to influence CA induction.

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