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The aim of study was to analyze size structure and population parameters of blue swimming crabs (P. pelagicus) in the Toronipa waters which was conducted from March to August 2014. Total of samples obtained were 376 male and 331 female blue swimming crabs. Based on the results of t-test, the correlation between carapace width body weight of blue swimming crabs showed isometric growth pattern of both male and female, with a strong coefficient correlation. Those blue swimming crabs were analyzed and were found into three age groups (cohorts). Those blue swimming crabs were dominant in the cohort of cacapace wide average of 91.92 mm. Population parameters of L∞, K, and t0 of male and female blue swimming crab were quite different, namely CW∞ of 155.76 mm, K of 0.83/year, and t0 of -0.126 for males, while CW∞ of 184.82 mm, K of 0.43/year, and t0 of -0.231 for males. Those data showed that blue swimming crab in this waters should be maintained and well managed its surrounding due to K value of both sexes are quite low and will take time to reach those CW∞ value of both sexes. It is hoped that the data in this study may be used to management formulation of blue swimming crabs in the Toronipa waters in order to sustain its population.

Struktur Ukuran dan Parameter Populasi Rajungan (Portunus pelagicus, Linnaeus 1758) di Perairan Toronipa, Sulawesi Tenggara, Indonesia