Journal of experimental zoology. Part A, Comparative experimental biology

Changes in gill enzyme levels and activity in green crabs exposed to low salt water

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Abstract

Hemolymph osmolality stabilized at new values by 24 hours after green crabs were transferred from 32 ppt to 10 ppt salinity.

  • A large increase in carbonic anhydrase (CA) mRNA concentrations in the posterior gills was observed by 24 hours post-transfer, remaining elevated for 4 days.
  • CA activity started to increase 48 hours after transfer, continuing to rise through 7 days.
  • CA protein concentration increased by 5-fold in the posterior gills of crabs acclimated to 10 ppt salinity.
  • No changes in CA activity, mRNA expression, or CA protein concentrations were detected in the anterior gills.
  • The observed changes in mRNA levels were transient, whereas the synthesized CA protein persisted in the gills for an extended period.
  • In separate experiments, CA activity and mRNA concentrations increased with decreasing salinity, peaking at 15 ppt before decreasing at 10 ppt.

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