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Crabs are considered non-native crustacean species in Bardawill lagoon whichrequire more studies. Length frequency analysis were used to estimate size distribution, growth,maturity, mortality and yield per recruit of Blue swimming crab, Portunus pelagicus in Bardawilllagoon during the fishing season 2016. Samples were obtained from trammel fishing vessels. Carapacewidth of 1068 samples ranged from 4.7 to 13.4 cm and total weight from 10.4 to 198.3 g. Sizedistribution showed the major portion of the catch ranged of 8 to 10.9 cm carapace width. FiSAT IIcomputer program was used to estimate the growth parameters as L∞ = 14.3 cm and K = 1.1 yr-1. Thegrowth performance index (o’) equal 2.358. Recruitment was extent from June to October. Sex ratiobetween male and female were 1.09: 1. The size at first maturity (CWm50) was estimated at 9.1cm.Total, natural and fishing mortality rates were 4.25 yr−1, 1.6 yr−1 and 2.65 yr−1, respectively. Size atfirst capture (CWc50) was 8.6 cm. So, stock of Blue crab in Bardawill lagoon should be controlled byincreased the fishing effort and adding unconventional fishing methods such as traps with traditionalfishing such as trammel, trawlers and gillnetters, as this species may be become dangerous on nativespecies in region.

BIOLOGY AND POPULATION DYNAMIC OF BLUE SWIMMING CRAB Portunus pelagicus IN BARDAWILL LAGOON, NORTH SINAI, EGYPT