Penelitian ini bertujuan mengetahui jenis-jenis udang dan kepiting, menentukan kepadatan, morfometrik dan mengetahui parameter kualitas air (suhu, pH dan salinitas) di perairan mangrove Kelurahan Meras Kecamatan Bunaken, Kota Manado. Hasil penelitian, diperoleh 4 spesies udang genus Penaeus dengan total 251 ekor (♂: 115 ekor dan ♀: 136 ekor). Kepiting yang didapatkan 10 spesies dari tiga genus yaitu Uca (295 ekor), Portunus (12 ekor) dan Scylla (53 ekor). Total kepiting yang ditemukan 360 ekor (♂: 203 ekor dan ♀: 157 ekor). Kepadatan tertinggi udang P. monodon, yaitu 0,092 ind/m 2 sedangkan terendah P. merguiensis, yaitu 0,055 ind/m 2 . Kepadatan tertinggi kepiting U. annulipes, yaitu 0,126 ind/m 2 sedangkan terendah P. trituberculatus, yaitu 0,003 ind/m 2 . Pengukuran morfometrik tertinggi udang P. monodon yaitu ♂: 19,9 cm, ♀: 17,8 cm sedangkan terendah P. semisulcatus yaitu ♂: 11,3 cm, ♀: 10,5 cm dan morfometrik kepiting tertinggi pada S. serrata yaitu ♂: 20,3 cm, ♀: 16,1 cm sedangkan terendah U. annulipes yaitu ♂: 3,7 cm, ♀: 2,4 cm. Hasil pengukuran parameter kualitas air, meliputi: suhu (27-30 0 C), derajat keasaman (pH 6,9-8) dan salinitas (27-33 ppt), Kata Kunci : Inventarisasi; Cruise method; Udang; Kepiting; MangroveThe purpose of this research is to describe the types of shrimp and crab, to decide the solidity, to decide the morphometric and to find out the parameter of water quality (temperature, pH and salinity) in mangrove water at Meras, Bunaken subdistrict, Manado. The result of this research found 4 species of shrimps genus Penaeus with total 251 (♂: 115 and ♀: 136 ). The founded crabs are 10 species from three genus, they are Uca (295), Portunus (12) and Scylla (53). The total of founded crab are 360 (♂: 203 and ♀: 157). The highest solidity of shrimp is P. monodon that is 0,092 ind/m 2 , the lowest is P. trituberculatus that is 0,003 ind/m 2 . The highest morphometric measurement of shrimp is P. monodon that is ♂: 19,9 cm, ♀: 17,8 cm while the lowest is P. semisulcatus that is ♂: 11,3 cm, ♀: 10,5 cm and the highest crab morphometric is S. serrata that is ♂: 20,3 cm, ♀: 16,1 cm while the lowest is U. annulipes that is ♂: 3,7 cm, ♀: 2,4 cm. The parameter measurement result of water quality, include: temperature (27-30 0 C), acidity degree (pH 6,9-8) and salinity (27-33 ppt).
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