Pangkajene and Islands Regency, or better known as Pangkep Regency, is geographically located between 110o - 113o East Longitude and 0.40o-0.80o South Latitude, located on the West coast of South Sulawesi. As the name implies, namely Islands, Rajungan (Portunus pelagicus) is one of the important economic catches for fishermen in Bawasalo Village, Segeri District, Pangkep Regency. The fishing gear used to catch blue swimming crabs in Bawasalo waters is a trap-like fishing gear, namely the dragon trap, which is often used by fishermen. Dragon trap is a fishing gear for shrimp, crab, fish and others, which has a long shape resembling a dragon snake with alternate doors. The crab catches using bubu naga fishing gear fluctuated, at certain times the crab catches increased and even reached the peak of their catches, and at certain times the catches decreased or even didn't exist at all. The fluctuation in crab catches requires an optimal strategy for crab fishing operations, one of which is by identifying the factors that affect crab catches. The fluctuation in crab catches is influenced by internal and external factors. One of the external factors that affect the fluctuation of crab catch is the moon phase

The results showed that the distribution of size and weight in the dark moon phase with an average size of 9.3cm with an average weight of 40.9gr (males) and obtained an average size of 9.9cm with an average weight of 38.6cm (females). 10.1 cm with an average weight of 53.7 grams (males) and an average size of 10.6 cm with a weight of 60.1 grams (females) and in the final ¼ moon phase, an average size distribution of 9.8 cm with an average weight of 54.3 grams (males) and an average size of 10.4 with an average weight of 59.9 grams (females). There is a significant influence between crab catches in the dark moon phase, early 1/4, full moon and late ¼ moon.