Pertumbuhan dan padatnya jumlah penduduk di wilayah pesisir menyebabkan dampak buruk bagi lingkungan terutama bagi usaha budidaya di tambak. Sampah plastik yang akan terakumulasi dan terfragmentasi menjadi ukuran yang kecil hingga berukuran 5 mm atau lebih kecil yang disebut mikroplastik. Mikroplastik dapat membahayakan biota yang dibudidayakan di tambak, seperti udang Windu (Penaeus monodon) yang merupakan komoditi dengan nilai ekonomis tinggi. Bukan hanya berbahaya bagi udang, namun juga berbahaya untuk manusia yang mengkonsumsinya. Tujuan dari penelitian ini untuk mengetahui keberadaan, bentuk, warna, ukuran dan kelimpahan mikroplastik pada udang windu (Penaeus monodon) di tambak tradisional Kota Tarakan. Metode penentuan lokasi menggunakan metode purposive sampling berdasarkan aktivitas di lokasi Tambak Juwata permai Tarakan Utara (1), lokasi Bandara Tarakan Barat (2), dan tambak dilokasi Islamic center Tarakan Timur (3). Organ target yang dianalisis adalah insang dan usus. Ekstraksi sampel menggunakan metode Lumban Tobing (2020), yaitu melalui ekstraksi destruksi alkali dengan penambahan larutan KOH 10%, dan Penyaringan sampel menggunakan Cellulose Nitrate Membrane Filter 0,45 um, 47 mm, kemudian diamati menggunakan mikroskop Nikon type eclipse Ti2- U dengan perbesaran paling rendah 4x/0.10. Keberadaan mikroplastik pada tubuh Udang windu (Penaeus monodon) telah terindentifikasi pada semua lokasi tambak. Pada lokasi (1) di ditemukan mikroplastik sebanyak 172 partikel, tambak (2) 208 partikel, dan tambak (3) 160 partikel. Bentuk mikroplastik yang ditemukan adalah fiber, film, fragmen dan filamen. Warna mikroplastik yang teridentifikasi adalah wama hitam, merah, biru, coklat, putih, ungu, dan hijau, Ukuran yang ditemukan yaitu mulai dari 20 um- >5000 µm. Kelimpahan mikroplastik pada lokasi tambak (1) yaitu 11,47 partikel/individu, tambak (2) 13,87 partikel/individu dan lokasi tambak (3) 10,67 partikel/individu.
Kata kunci: Mikroplastik, Tambak Tradisional, Udang Windu, Keberadaan, Kelimpahan

The growth and density of the population in coastal areas have negative impacts on the environment, particularly for prawns farming. Plastic waste that is accumulated and fragmented into small sizes of up to 5 mm or smaller is called microplastic. Microplastic can harm biota cultivated in shrimp farms, such as giant tiger prawn (Penaeus monodon), which is a commodity with high economic value, not only dangerous for prawns but also for humans who consume them. The objective of this research was to determine the presence, shape, color, size, and abundance of microplastic in giant tiger prawns (Penaeus monodon) in the traditional shrimp farms of Tarakan City. The location was determined using a purposive sampling method based on the activities in the shrimp farms of (1) Juwata Permai at North Tarakan as the first location, (2) Airport at West Tarakan as the second location, and (3) Islamic Center at East Tarakan as the third location. The target organs analyzed were gills and intestines. The sample extraction employed Lumban Tobing method (2020), namely through alkaline destruction extraction with the addition of 10% KOH solution, and the sample filtering used a Cellulose Nitrate Membrane Filter 0.45 µm, 47 mm, then was observed using a Nikon microscope of eclipse Ti2-U type with magnification as low as 4x/0.10. The presence of microplastic in the bodies of the giant tiger prawns (Penaeus monodon) was identified in all shrimp farm locations, namely, 172 microplastic particles were found in the first location, 208 particles in the second location, and 160 particles in the third location. The forms of microplastic found were fibers, films, fragments, and filaments. The identified microplastic colors were black, red, blue, brown, white, purple, and green. The sizes of microplastic found were ranged from 20 μm- >5000 μm. The abundance of microplastic at the first shrimp farm location was 11.47 particles/individual, at the second shrimp farm location was 13.87 particles/individual, and at the last location was 10.67 particles/individual. Keywords: Microplastic, Traditional Shrimp Farms, Giant Tiger Prawns, Presence, Abundance