Ekosistem mangrove di wilayah Karangsong Kabupaten Indramayu merupakan salah satu ekosistem hasil rehabilitasi yang dimanfaatkan menjadi kawasan ekowisata. Penelitian dilaksanakan pada bulan Agustus 2018 di Kawasan Ekowisata Karangsong Kabupaten Indramayu guna mengetahui kondisis ekosistem mangrove dengan menggunakan metode Transek Line Plot (TLP). Stasiun pengamatan diambil berdasarkan waktu rehabilitasi dan keterwakilan wilayah pada bagian selatan, bagian tengah dan bagian utara kawasan ekowisata mangrove Karangsong. Berdasarkan hasil penelitian, terdapat komposisi jenis dari dua spesies mangrove yaitu Avicennia marina dan Rhizophora mucronata. Kerapatan pada tingkat pohon di ekosistem mangrove Karangsong termasuk kedalam kategori rusak pada seluruh stasiun dengan nilai kerapatan masing-masing sebesar 633 ind/ha untuk stasiun 1, 366 ind/ha untuk stasiun 2 dan 100 ind/ha stasiun 3, tetapi menuju perkembangan kearah yang lebih baik ditunjukan dengan nilai kerapatan yang tinggi pada tingkat pancang dan semai. Parameter kualitas air seperti suhu, salinitas dan pH perairan serta jenis substrat berlumpur mendukung untuk pertumbuhan mangrove.
Tembang is a pelagic fish which is important in Indonesia and the development on the Sunda Strait. The Indian Ocean Dipole could affect oceanography and at the same time will affect the population of fishes. The aim of this study was to determine the effect of IOD and oceanographic factors on the catch of Tembang fish. This research was conducted in the Sunda Strait waters by looking at the Dipole Mode Index (DMI) and oceanographic ocean conditions such as sea surface temperature and chlorophyll as well as the production of fish catches for 11 years from 2008-2018. IOD affects the catch of Tembang fish by 35.8%. Temperature influences the catch of Tembang fish in the Sunda Strait by 9.48%. Klorofil-a influences the catch of Tembang fish in Sunda Strait by 38.6%. DMI, Temperature, and Chlorophyll affect fish catches by 26.9%.
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