ON THE BEHAVIOR OF MARINE CRUSTACEANS IN AN ELECTRICAL FIELD OF ALTERNATING CURRENT

Abstract

The minimum flow of current essential to produce electronarQ
cosis and fixation in marine crustaceans, Metapenaeus affinis1 Parapenaeopsis
styli(era1 Panulirus ornatus and Neptunus sanguinofentus in
an AC field of specific strength varied with the lengths of animals
tested, except in case of the last one where the increase in size of
animals showed no significant effect on the effective period for
different reactions. M. affinis in interrupted AC required threshold
pulses for narcosis and fixation, which varied inversely with the
length of the organism. Animals ~mbjected to current of higher
effective period required Ion ger time for recovery in interrupted AC
of 50 cfs. The period for narcosis and recovery of M. af(tnis did not
vary significantly with repeated stimulations on the same organism