Text this: Efektivitas Rasio Jumlah Pasangan Induk Ikan Hias Black Tetra (Gymnocorymbus ternetzi) Terhadap Hasil Pemijahan <br><i>[The Effectiveness Of The Ratio Of The Number Of Pairs Of Parents Of Pair Of Parents Of Black Tetra (Gymnocorymbus ternetzi) Against The Result Of Spawning]<i>