Fig. 1. (A) Maximal Na⁺ secretion rate from lingual salt glands of restrained C. porosus juveniles acclimated to either freshwater (black bars) or saltwater (grey bars) conditions. (B) Na⁺ secretion rates from lingual salt glands over 40 min post-stimulation by methacholine chloride (2 mg kg^–1). Values are means ± s.e.m.; N=6 per treatment. Asterisks indicate a significant difference between FW- and SW-acclimated treatment groups at the level of P<0.05.