EFEKTIFITAS KIJING AIR TAWAR ( Pilsbryoconcha exilis ) SEBAGAI BIOFILTER DALAM SISTEM RESIRKULASI TERHADAP LAJU PENYERAPAN AMONIAK DAN PERTUMBUHAN IKAN LELE SANGKURIANG (Clarias gariepinus)
Abstract
Tujuan dari penelitian ini adalah untuk mempelajari pengaruh penggunaan kijing air tawar (Pilsbryoconcha exilis) terhadap perbaikan kualitas air dan laju pertumbuhan lele sangkuriang. Penelitian ini menggunakan Rancangan Acak Lengkap dengan empat perlakuan dan tiga ulangan. Penelitian menggunakan perbedaan jumlah hewan kijing air tawar yaitu 100, 150, 200 ekor/ keranjang berukuran 0,6 m3 dan perlakuan kontrol yaitu tanpa menggunakan perlakuan sistem resirkulasi dan tanpa penambahan kijing air tawar. Parameter utama dalam penelitian ini adalah pertumbuhan ikan dan konsentrasi amoniak, dengan parameter pendukung antara lain yakni suhu, pH, dan oksigen terlarut. Hasil penelitian menunjukkan bahwa penambahan kijing air tawar berpengaruh terhadap pertumbuhan dan kelangsungan hidup ikan lele sangkuriang. Pertumbuhan mutlak tertinggi terdapat pada perlakuan 200 individu dengan berat 19.71 gr dan tingkat kelangsung hidup tertinggi terdapat perlakuan 200 individu (80.14 %). Hasil penelitian juga menunjukan bahwa penambahan kijing air tawar dengan jumlah yang berbeda memberikan pengaruh nyata terhadap penurunan amoniak. Berdasarkan hasil uji Beda Nyata Terkecil (BNT) perlakuan dengan penambahan kijing air tawar sebanyak 200 ekor/ keranjang berukuran 0,6 m3merupakan perlakuan terbaik dalam penurunan amoniak pada sistem resirkulasi.
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