The aim of this research was to determine effect of feed plants on growth of grass carp, Stenopharyngodon idella. Grass carp used had an average length of 12.8 cm and weight of 21.00 g. Fish were kept in 12 pouch nets with a density of 8 fish/net. Fish was fed in et libithum, twice a day. This research used Completely Randomized Design with four treatments: A Pennistum purpureum, B Eichornia crassipes, C Pistia stratiotes and D Azolla pinnata, each with three replications. Data from each treatment were statistically analyzed using analysis of variance and LSD. Research results showed that growth of fish in treatment C was significantly different as compared to other treatments. Length of fish reached 3.30 cm, absolute growth 22.12 g and relative growth achieved 103.60%. thus, application of feed plant Pistia stratiotes might improved growth of grass carp.

Title (Bahasa Indonesia): Pertumbuhan ikan koan (Ctenopharyngodon idella) yang diberi pakan Azolla This research was done for two months to analyze the growth of grass carp (length 7.00-10.00 cm and initial weight 5.00-10.00 gr) fed on pellets with azolla meal that replaces fish meal on different levels and fresh azolla. Experimental research methodology used Completely Randomized Design. The best result wasshowed on treatment using fresh azolla. This is to confirm that using azolla on young stages for culture of grass carp can be done to reduced cost of production.Penelitian dilakukan selama dua bulan untuk menganalisis pertumbuhan ikan koan (berukuran panjang 7,00-10,00 cm dan berat awal 5,00-10,00 gr) yang diberi pakan pelet dan subtitusi tepung azolla terhadap tepung ikan dengan kadar yang berbeda, serta azolla segar. Metode penelitian secara eksperimental, menggunakan Rancangan Acak Lengkap. Hasil terbaik ditunjukkan pada perlakuan dengan pakan azolla segar. Hasil ini mengkonfirmasi, bahwa penggunaan azolla dapat dilakukan untuk budidaya ikan grass carp pada stadia benih dalam menekan biaya produksi.