The annual breeding cycle of the crab, Barytelphusa cunicularis, was determined
by measuring monthly the size of the gpnad relative to the size of the
animal. The peak of gonad size appeared in rainy season (June to September)
showing the maximum breeding activity during these months. Histological observations
of the monthly gonads revealed that the ripening of the gonads started
during March and extended upto May. By June the gonads of most of the
individuals attained full maturity and spawning began. Spawning terminated by
the end of September and the gonads entered a quiescent period
