Sejalan Dengan Berkembangnya Usaha Budidaya Udang Tersebut, Terdapat Pula Beberapa Masalah Yang Mengganggu, Sehingga Menghambat Perkembangan Usaha Budidaya, Yaitu Hama Dan Penyakit Ikan. Penelitian Ini Bertujuan Menganalisis Jumlah Prevalensi Dan Intensitas Ektoparasit Protozoa Pada Udang Windu (Penaeus Monodon) Di Tambak Ekstensif Yang Terdapat Di Pulau Keranjasan Muara Bulungan, Kalimantan Utara. Penelitian Ini Dilakukan Pada Bulan Desember 2015 Sampai Januari 2016. Udang Windu Diambil Sebanyak 30 Ekor Pada Tiga Tambak Berbeda. Analisa Ektoparasit Protozoa Dilakukan Di Stasiun Karantina Ikan Kota Tarakan, Sementara Analisa Kualitas Air Dilakukan Secara Insitu Dan Eksitu Di Laboratorium Kualitas Air FPIK UBT. Berdasarkan Hasil Penelitian Diketahui Bahwa Dari 30 Sampel Yang Diambil Dari Tiga Lokasi Tambak Di Pulau Keranjasan Diperoleh 8 Sampel Positif Terinfeksi Ektoparasit (26,66%). 10 Sampel Dari Tambak 1 Di Peroleh 4 Sampel Positif Terinfeksi Ektoparasit (40%), 10 Sampel Dari Tambak 2 Di Pulau Keranjasan Diperoleh 3 Sampel Terinfeksi Ektoparasit (30%), Positif Terinfeksi 10 Sampel Dari Tambak 3 Diperoleh 1 Sampel Yang Terinfeksi Ektoparasit (10%). Bahwa Dari Hasil Penelitian Di Lapangan Salah Satu Faktor Dominannya Vorticella Sp. Intensitas Serangan Parasit Tertinggi Adalah Pada Tambak 1 Dan 2 Sedangkan Yang Terendah Adalah Di Tambak 3.
Kata Kunci: Ektoparasit, Protozoa, Udang Windu, Prevalensi Dan Intensitas, Tambak Ekstensif Pulau Keranjasan

In Line With The Development Of Shrimp Farming, There Are Also Some Problems That Plague, Thus Inhibiting The Development Of Farming, Which Are Pests And Fish Diseases. This Study Aims To Analyze Ectoparasites Protozoa In Black Tiger Shrimp (Penaeus Monodon) In The Extensive Pond Located At Keranjasan Estuary Of Bulungan, Bulungan District. This Research Was Conducted From December 2015 Until April 2016. 30 Tiger Shrimps Was From Three Different Ponds. The Analysis Of Ectoparasites Protozoa Was Conducted In Fish Quarantine Station In Tarakan City, While Water Quality Analysis Was Conducted By Insitu And Eksituin The Water Quality Laboratory Of FPIK UBT. Based On The Results Of This Study, It Is Revealed That Out Of 30 Samples Taken From Three Different Ponds In Keranjasan Islan Obtained 8 Positive Samples Infected By Ectoparasites (26.66%). 10 Samples Of Pond 1 Obtained 4 Positive Samples Infected With Ectoparasites (40%), 10 Samples From Ponds 2 In Keranjasan Island Obtained 3 Samples Positive Infected Ectoparasites (30%), 10 Samples From Pond 3 Obtained 1 Sample Positive Infected Ectoparasites (10 %). The Result Of This Field Research Shows One Dominant Factor Is Vorticella Sp. The Highest Intensity Of Parasite Attacks Is In The Ponds 1 And 2 While The Lowest Is In The Pond 3. Keywords: Ectoparasites, Protozoa, Tiger Shrimp, Prevalence And Intensity, Extensive Pond Keranjasan