Fish were not fed 48 h prior to and during the trials. Experimental salinities were produced by dissolving non-iodized NaCl rock salt in freshwater and adjusted with an optical refractometer ŽAtago. to the nearest 1 ppt
Fish were not fed 48 h prior to and duringthe trials. Experimental salinities were produced by dissolving non-iodized NaCl rocksalt in freshwater and adjusted with an optical refractometer ŽAtago. to the nearest 1 ppt