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Table 1.

Shape factor of Na+/K+-ATPase and CFTR-immunoreactive areas of chloride cells, staining intensity of NKCC in chloride cells, and whole gill Na+/K+-ATPase activity in Hawaiian goby acclimated to freshwater, 20‰ and 30‰seawater

Freshwater20‰ Salinity30‰ Salinity
Na+/K+-ATPase shape factor Primary 0.68±0.01 0.68±0.01 0.67±0.01 
 Secondary 0.61±0.01a 0.52±0.01b 0.55±0.02b 
CFTR shape factor Primary 0.95±0.02 0.97±0.01 0.97±0.01 
 Secondary 0.94±0.02 0.96±0.01 0.95±0.01 
NKCC staining intensity Primary 98.4±1.6 94.4±1.3 98.2±1.3 
 Secondary 85.9±1.7a 91.1±1.7b 95.2±1.7c 
Gill Na+/K+-ATPase activity  7.6±0.5 8.9±0.5 9.4±0.6 
Freshwater20‰ Salinity30‰ Salinity
Na+/K+-ATPase shape factor Primary 0.68±0.01 0.68±0.01 0.67±0.01 
 Secondary 0.61±0.01a 0.52±0.01b 0.55±0.02b 
CFTR shape factor Primary 0.95±0.02 0.97±0.01 0.97±0.01 
 Secondary 0.94±0.02 0.96±0.01 0.95±0.01 
NKCC staining intensity Primary 98.4±1.6 94.4±1.3 98.2±1.3 
 Secondary 85.9±1.7a 91.1±1.7b 95.2±1.7c 
Gill Na+/K+-ATPase activity  7.6±0.5 8.9±0.5 9.4±0.6 

At least 100 cells per individual and five individuals in each treatment group were measured. Gill Na+/K+-ATPase activity was measured in six individuals from each group. Values are expressed as means± S.E.M.

NKCC, Na+/K+/2Cl- cotransporter; CFTR,cystic fibrosis transmembrane conductance regulator.

Different superscript letters indicate that the means are significantly different from one another (P<0.05,Student—Newman—Keuls test).

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