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Quality and quantity of freshwater were important factors in aquaculture. The farmers of neon tetra fish ( Paracheriodon innesi ) usually rear them in aquarium with simple methods, so that gave low productivity. Increasing density could be increased the production and its continuity and also more efficient in land and water. Rearing of neon tetra with density of 25, 50, 75 and 100 litre -1 in recirculation system were no influence for fish body length, growth of body length and coefficient of variants (p>0,05). But those densities of fish rearing affected survival rate, end density and profit (p -1 was 68.57 litre -1 and gave the highest profit. Keywords : density, resirculation, neon tetra fish Paracheirodon innesi ABSTRAK Sumber air tawar yang merupakan faktor terpenting dalam kegiatan budidaya ikan semakin hari semakin menurun, baik kualitas maupun kuantitasnya terutama di daerah perkotaan. Petani ikan neon tetra ( Paracheriodon innesi ) biasanya mendederkannya pada akuarium dengan cara sederhana sehingga produktivitasnya rendah. Peningkatan padat penebaran ikan dilakukan agar efisiensi lahan dan air dapat ditingkatkan, yang selanjutnya dapat meningkatkan produksi secara kontinyu sehingga dapat memenuhi permintaan pasar.  Pemeliharaan ikan neon tetra dengan padat tebar 25, 50, 75 dan 100 ekor/liter dalam sistem resirkulasi ternyata tidak memberikan pengaruh nyata terhadap panjang dan laju pertumbuhan panjang ikan, serta koefisien keragaman (p>0,05), namun berpengaruh nyata terhadap kelangsungan hidup, kepadatan akhir dan keuntungan (p Kata kunci : padat tebar, resirkulasi, ikan neon tetra Paracheirodon innesi

Production of M-Size Neon Tetra Fish Paracheriodon innesi in Recirculation System with Density of 25, 50, 75 and 100 litre-1