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Osmoregulation and branchial Na,K-ATPase in the lobster Homarus gammarus acclimated to dilute seawater

Osmoregulatory ability of Na,K-ATPase activity in gills and epipodites were examined following transfer of the lobster Homarus gammarus from seawater to dilute seawater. The lobster behaves as an osmoconformer in seawater and as an poor hyperosmoregulator when equilibrated in dilute seawater.These results provide,for the first time, physiological evidence that besides trichobranchiate gills, epipodites have an osmoregulatory role in the lobster Homarus gammarus.

lobster; gills; epipodite; short-circuit current; Na;K-ATPase; Homarus gammarus

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