Violin Crab (Uca) is type of crab living in mangrove habitat as a detrivore. In Bengkulu, the mangrove forest zone locates in many areas, including Kahyapu, Enggano Island and Gulf of Muaro Labu Nawi, Pulau Baai, Bengkulu City. The objective of this experiment was to investigate the pattern of Violin Crab distribution at mangrove forest in Kahyapu and Gulf of Muaro. The methodology used in this experiment, carried out from 2017 to 2018, was a survey done by random sampling. The samples were taken from 2 stations at 10 plots, whose size was1m x 1m each. The variable measured included the crab pattern of distribution and abiotic factor which might affect the growth of the crabs, such as water pH, temperature, and salinity Muaro Labu Nawi. However, the total Biola crab in these two habitats was 11, including Uca annulipes

Mangrove forest in Cagar Alam of Klowe Bay is one of the conservation forest on Enggano Island. Mangroves for serving as an ecological function that can keep from coastal abrasion. Mangroves can also be used as a habitat for water biota, one of which is crustaceans. The aim of this research is identification the types of Crustaceans in Klowe Bay Cagar Alam, Kahyapu Village, Enggano Island, North Bengkulu Regency. This research was conducted in January 2018 with exploration methods and the data were analyzed by descriptive qualitative. Based on theresults of the study, obtained 13 species, with the most genera found in Uca. The species found consist of Coenobita violascens, Uca annulipes, Uca boninensis, Uca crassipes, Uca dussumeiri, Uca tetragonon, Uca