The purpose of this review is to summarize and update the reader on th
e topic of lobster reproduction. Recent work on the American clawed lo
bster, Homarus americanus, has found that males are capable of multipl
e inseminations. Intermolt females may augment stored sperm with inter
molt inseminations. Intermolt insemination may account for added fecun
dity in a normal population. Both photoperiod and temperature interact
to regulate female yolk biosynthesis. Extraovarian yolk synthesis in
clawed lobsters has been demonstrated by the measurement of yolk prote
ins in the hemolymph. The complete chemical characterization of both m
olt inhibiting hormone and vitellogenesis inhibiting hormone has been
accomplished. Multiple field studies of tropical spiny lobsters were a
ccomplished in the last five years. The occurrence of multiple broods
(2-5) per season per lobster have been documented in several cases. Th
e effects of photoperiod and temperature variations on reproductive be
havior of spiny lobsters was reported. Yolk biosynthesis in both hepat
opancreas and ovary of tropical spiny lobsters was demonstrated.