KONTRIBUSI BIOFLOK TERHADAP PERTUMBUHAN IKAN LELE YANG DIBERI PAKAN DENGAN TINGKAT BERBEDA
Abstract
Biomassa bioflok dalam sistem pemeliharaan ikan dapat dimanfaatkan menjadi pakan alami tambahan bagi ikan. Penelitian ini bertujuan untuk mengevaluasi kinerja pertumbuhan ikan lele Clarias gariepinus yang dipelihara menggunakan teknologi bioflok dengan tingkat pemberian pakan berbeda. Perlakuan terdiri dari tiga tingkat pemberian pakan, yaitu 5% (FR5), 3,75% (FR3,75), dan 2,5% (FR2,5). Benih ikan lele dengan panjang awal 11,92 ± 0,03 cm dan bobot awal 11,31 ± 0,11 g dipelihara dengan padat tebar 25 ekor per akuarium (500 ekor m-3) selama 42 hari. Ulangan biologis tiap perlakuan berupa 3 unit akuarium (volume air 50 L). Ikan diberi pakan 3 kali setiap hari dengan jumlah pakan sesuai perlakuan. Penambahan tepung tapioka dilakukan setiap hari untuk mencapai rasio C/N 10. Hasil penelitian menunjukkan bobot akhir menurun seiring penurunan tingkat pemberian pakan (P<0,05), seperti ditunjukkan pula laju pertumbuhan spesifik. Terdapat indikasi kontribusi bioflok terhadap kinerja pertumbuhan ikan lele berdasarkan nilai efisiensi pemanfaatan pakan dan retensi protein. Akan tetapi, tidak dapat menggantikan peran pakan eksternal. Tingkat pemberian pakan berpengaruh terhadap kinerja pertumbuhan ikan lele pada sistem bioflok.
Biofloc biomass could be used as additional natural food for fish in a biofloc-based fish culture system. This study aimed to evaluate the growth performance of African catfish, Clarias gariepinus cultured in a biofloc system fed at different feeding levels. The treatments consisted of three feeding levels; 5% (FR5), 3,75% (FR3,75), and 2,5% (FR2,5). Catfish juveniles with an initial average body length of 11,92 ± 0,03 cm and average body weight of 11,31 ± 0,11 g were reared at a density of 25 fish per aquarium (500 fish m-3) for 42 days. Each treatment had three unit aquaria (50 L water volume) as replicates. Cassava meal was added daily to reach C/N ratio of 10. The results showed that the fish’s final weight and specific growth rate were reduced, corresponding to the feeding rate. There was an indication that biofloc contributes to the fish growth performance based on the feed efficiency and protein retention level. However, biofloc could not replace the role of external feed to support the growth of African catfish.
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DOI: http://dx.doi.org/10.15578/jra.17.2.2022.59-70
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