THE EFFECT OF LAMTORO LEAF FLOUR (Leucaena leucocephala) IN FEED ON THE GROWTH OF TILAPIA (Oreochromis niloticus) Fadilatul Mukaromah 1 * . Kiki Haetami 1 . Aulia Andhikawati 1 . Roffi Grandiosa 1 ABSTRACT Tilapia is favored for its rapid growth and adaptability to di- verse aquatic environments, making it a widely cultivated fish. In fish farming activities, feed provides the largest con- tribution to the total production cost. So that farmers must use alternative feed to reduce feed costs. One alternative feed for tilapia that is easy to obtain, afford- able and sustainably available is lamtoro leaves. The aim of this research was to determine the effect of adding lamtoro leaf flour to feed at different concentrations on the growth of tilapia (O. niloticus). The average weight of ti- lapia at the beginning of the study was 5,7 grams. This research was conducted for 40 days starting in May until June 2023, taking place in Kertayasa Village, 1 Program Studi Perikanan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Padjadjaran. * E-mail: fadilatul19001@mail.unpad.ac.id Cijulang District, Pangandaran Re- gency. The method used in this research was an experimental method using a completely randomized design (CRD) with 4 treatments and 3 replications, namely treatment A: 100% commercial feed (control), treatment B: commercial feed + 5% lamtoro leaf flour, treatment C: commercial feed + 10% lamtoro leaf meal, and treatment D: commercial feed + 15% lamtoro leaf meal. Parameters observed included daily growth rate (SGR), absolute length growth, and wa- ter quality. The results indicated a sig- nificant effect (P<0.05) on the daily growth rate (SGR) by incorporating lamtoro leaf flour into the feed. The highest treatment, observed in treatment C at 50%/day, resulted in the maximum AQUASAINS Jurnal Ilmu Perikanan dan Sumberdaya Perairan (Vol 12 No. 2 Tahun 2024)