Purwonegoro Fish Market in Banjarnegara district is the largest fish market in southern and western Central Java. This fish market serves as a center for buying and selling fish and fish fry traffic in a particular place to the location of the fish farmers. This activity possibly spreads a particular type of disease from one area to another. Trichodina sp. is found on gouramy fish fry in hatchery center area with the pathogenicity level of 80%. Trichodina sp. has a big impact in the gouramy farming by dangerously reduces the physical condition of the fish and cause death of gouramy fry. The results showed that as many as 56 gouramy fish fry were infected by Trichodina sp. from 150 gouramy fish fry examined. Total number of Trichodina sp. found was 573 individual from the infected gouramy fry. Total intensity of Trichodina sp. of gouramy fry was 10,97 individual/fish. The morphometric characters measurement of Trichodina sp. showed morphometric variation with the range of body diameter 47,5 -112,5 μm; denticle ring diameter 22,5 -47,5 μm; denticle diameter 12,5 -42,5 μm, adhesive disc diameter 37,5 -65 μm; membrane width 2,5 -7,5 μm and the number of denticle 13 -28. Trichodina sp. allegedly found were T. heterodentata, T. nigra, and T. acuta.Key Words : gouramy, Trichodina sp., intensity, morphometric variation. AbstrakPasar Ikan Purwonegoro, Kabupaten Banjarnegara merupakan pasar ikan terbesar se-Jawa Tengah bagian selatan dan barat. Pasar ikan ini berfungsi sebagai sentra jual beli ikan dan lalu lintas benih ikan di tempat tertentu ke lokasi petani ikan. Hal ini tidak menutup kemungkinan akan menyebarnya suatu jenis penyakit tertentu dari satu daerah ke daerah lain. Trichodina sp. ditemukan hampir di seluruh wilayah sentra jual-beli ikan gurami dengan tingkat patogenisitas mencapai 80%. Trichodina sp. memiliki peran besar dalam produksi budidaya ikan gurami dengan cara menurunkan kondisi fisik ikan sehingga membahayakan dan menimbulkan kematian ikan gurami pada fase benih. Hasil penelitian menunjukkan bahwa sebanyak 150 ekor benih ikan gurami yang diperiksa, 56 ekor benih yang terinfeksi Trichodina sp. Jumlah Trichodina sp. yang ditemukan sebanyak 573 individu dari benih yang terinfeksi. Intensitas total Trichodina sp. pada benih ikan gurami sebesar 10,97 individu/ekor dan tergolong cukup tinggi. Hasil pengukuran karakter morfometrik Trichodina sp. menunjukkan adanya variasi morfometrik dengan diameter tubuh 47,5 -112,5µm; diameter cincin dentikel 22,5-47,5µm ; diameter dentikel 12,5-42,5µm, diameter adhesive disc 37,5-65µm; lebar membran 2,5-7,5µm dan jumlah dentikel 13-28. Trichodina sp. yang ditemukan diduga terdapat tiga jenis yaitu T. heterodentata, T. nigra, dan T. acuta.
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