Penambahan mikroalga ke dalam sistem bioflok dapat meningkatkan nilai nutrisi bioflok dan kualitas bioflok dalam mengontrol limbah nitrogen media pemeliharaan ikan. Penelitian ini bertujuan untuk mengevaluasi penambahan mikroalga Chlorella sp. dan Spirulina sp. pada sistem bioflok untuk meningkatkan kinerja pertumbuhan ikan nila Oreochromis niloticus. Rancangan penelitian menggunakan rancangan acak lengkap (RAL) dengan 3 perlakuan dan 3 ulangan. Perlakuan penelitian adalah : 1) pemeliharaan ikan nila pada sistem bioflok tanpa penambahan mikroalga (BFT), 2) pemeliharaan ikan nila pada sistem bioflok dengan penambahan Chlorella sp. (BFT C), 3) pemeliharaan ikan nila pada sistem bioflok dengan penambahan Spirulina sp. (BFT S). Hasil penelitian menunjukkan bahwa perlakuan BFT C dan BFT S menunjukkan nilai laju pertumbuhan harian, biomassa akhir yang lebih tinggi daripada perlakuan BFT (P <0,05). BFT C dan BFT S memiliki nilai rasio konversi yang lebih baik dan berbeda nyata dengan perlakuan BFT (P <0,05). Nilai pengukuran kualitas air pada semua media pemeliharaan masih dalam level yang baik untuk pertumbuhan ikan nila.
<em>The research describes the patten of utilization of marine resources based on local wisdom in the Wabula community in Buton district. The data were collected by doing interwiews, observation, documentation, and study of literature. Then the data were analyzed descriptively and kualitatively. The results showed that in utilizing marine resources, Wabula community have a local wisdom called kaombo which is protected marine areas by the custom. When a marine area is designated as a kaombo a ban om the explotation of marine resources in the area applies. The prohibition is intended to provide a respite for the continuation of the proliferation of marine biota in kaombo ecosystem. A violation of the prohibition is subject to strict customary law. To preserve the local wisdom of Wabula community in the utilization of marine resources, then through the regulation of Buton Regent Number 13 of 2018, Wabula was designated as an area Customary Law Community in the management of marine resources based om local customary law. The regulation is considered as an ideal model for strengthening local community institutions in conserving marine resources in a sustainable manner.</em>
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