Abstract
In choice experiments Carcinus was found to have a preferred salinity range which lies between 80% S.W.‐120% S.W. (with ambient salinity at 34‰). Salinities separated by intervals of 10% S.W. were not distinguished, but differences of 25% S.W. were clearly distinguished in choices up to and including 50% S.W. v 75% S.W. and above 125% S.W., given the choice of 125% S.W. v 150% S.W. The results are discussed in the context of earlier work in which salinity cycles have been demonstrated to entrain locomotor tidal rhythmicity in Carcinus. Increases or decreases of salinity from ambient seawater exogenously induce increased locomotor activity, here defined as halokinesis.
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