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Effects of eyestalk ablation on carbonic anhydrase activity in the euryhaline blue crabCallinectes sapidus: neuroendocrine control of enzyme expression
How Removing Eyestalks Affects an Enzyme Controlled by the Nervous and Hormone Systems in Blue Crabs
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Abstract
Eyestalk ablation resulted in an approximate doubling of carbonic anhydrase activity in the gills of blue crabs acclimated to 35 ppt.
- Transfer of intact crabs to 28 ppt did not affect carbonic anhydrase activity, but prior eyestalk ablation led to a 5-fold increase in activity.
- There was a 7-fold increase in carbonic anhydrase activity in the gills of crabs transferred from 35 to 15 ppt, which was enhanced by eyestalk ablation.
- Hemolymph osmolality remained unaffected by eyestalk ablation, but slightly elevated in treated crabs.
- Methyl farnesoate concentrations were undetectable in intact crabs, while eyestalk ablation increased these levels, though they were still low and not related to salinity.
- These findings suggest that a regulatory substance in the eyestalk may repress carbonic anhydrase expression in high salinity conditions.
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