Sex ratios of two species of spider crabs, Libinia dubia H. Milne Edwards,1834 and L-emarginata Leach, 1815, in the area of Great Bay, New Jersey

Over a 7 year period, Libinia emarginata and L. dubia were sampled in the G reat Bay estuary (New Jersey) and the waters immediately adjacent to it, us ing a beam trawl and an otter trawl. At collection sites where L. emarginat a was common, the average male:female ratio was 2.5:1. Males were also sign ificantly larger than females.