Abstract
1. An increase in the rate of antennule flicking and gill bailing upon presentation of sea water solutions of a freeze-dried clam extract indicated detection of sapid substances by the blue crab, Callinectes sapidus.2. The threshold concentration at which crabs detected the sapid solution was 10-15 g/liter. Feeding behaviors were released at higher concentrations, 10-1 to 10-2 g/liter.3. Food deprivation for six days lowered the threshold for feeding behaviors but did not affect the detection threshold.
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