Dinoflagellata merupakan organisme eukariotik yang memiliki karakteristik khusus seperti adanya flagellar dan klorofil. Dinoflagellata toxin producer menghasilkan racun salah satunya yaitu Ciguatoksin penyebab Ciguatera Fish Poisonig (CFP). Taman Wisata Perairan (TWP) Gili Meno, Gili Air, dan Gili Trawangan yang umum disebut dengan Gili Matra, merupakan perairan laut yang berada di Kabupaten Lombok Utara, Nusa Tenggara Barat. Tujuan dari penelitian ini yaitu untuk mengidentifikasi, menganalisis kelimpahan, menganalisis dominansi, dan menganalisis korelasi antara parameter lingkungan dengan dinoflagellata bentik penyebab CFP yang menempati substrat buatan di Perairan Gili Matra. Metode penelitian yang digunakan adalah substrat buatan dan analisis data menggunakan indeks kekayaan, kemerataan, keanekaragaman, dominansi serta korelasi Spearman. Teramati genus Amphidinium, Coolia, Gambierdiscus, Ostropsis, dan Prorocentrum. Hasil perhitungan keseluruhan indeks berada pada kriteria rendah hingga sedang. Korelasi positif terlihat pada 5 dari 12 parameter lingkungan. Kesimpulan dari penelitian ini, terdapat korelasi positif antara parameter suhu, TSS, DO, nitrit, dan amonia terhadap kelimpahan dinoflagellata bentik, kelimpahan sel dinoflagellata bentik tertinggi didominasi oleh dinoflagellata dari genus Coolia.

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Dinoflagellates are eukaryotic organisms that have special characteristics such as the presence of flagellar and chlorophyll. Dinoflagellate toxin producers produce toxins, one of which is Ciguatoxin which causes Ciguatera Fish Poisonig (CFP). Aquatic Tourism Parks (TWP) Gili Meno, Gili Air, and Gili Trawangan, commonly known as Gili Matra, are marine waters located in North Lombok Regency, West Nusa Tenggara. The aims of this study were to identify, analyze abundance, analyze dominance, and analyze the correlation among environmental parameters and benthic dinoflagellates that cause CFP that occupy artificial substrates in Gili Matra Waters. The artificial substrates were used and Spearman's correlation were used to analyze the richness, evenness, diversity, and dominance. The genera Amphidinium, Coolia, Gambierdiscus, Ostropsis, and Prorocentrum were observed. The results of the calculation of the overall index are in the low to moderate criteria. The highest abundance of benthic dinoflagellate cells were dominated by the genera Coolia. Positive correlations were seen from 5 of 12 environmental parameters. The conclusion of this study, there is a positive correlation between the parameters of temperature, TSS, DO, nitrite, and ammonia on the abundance of benthic dinoflagellates, the highest abundance of benthic dinoflagellate cells is dominated by dinoflagellates from the genera Coolia.