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Amino acids are the smallest components that compose proteins. A number of amino acids will be conducted to one another through the intermediary of peptide bonds to form proteins. Amino acids have divided into two; those are essential amino acids and non-essential amino acids. The essential amino acids are amino acids that can not be synthesized by the body of fish; therefore the essential amino acids must be in feed. Lysine is one of the ten essentials amino acids , the function of lysine are for the growth and repair body tissues. This research was aimed to determine the effect of lysine in commercial feed on protein retention and energy retention of freshwater pomfret .The method used is experiment with a completely randomized design as an experimental design. The treatment used is different lysine levels , namely P0 ( 0 % ) , P1 ( 0.6 % ) , P2 ( 1.2 % ), P3 ( 2.4 % ) , P4 (4.8 % ) and treatment was repeated 4 times. The main parameters were observed protein retention and energy retention on pomfret fresh water. Parameters measured were supported by water quality parameters. Analysis of the data using Analysis of Varian ( ANOVA ) and to determine the best treatment used Duncan 's multiple range test. The results showed the significant differences ( p < 0.05 ) in protein retention and energy were freshwater pomfret fish meat. Retention of protein and energy retention in treatment P1 ( 0.6 % lysine ) , P2 ( 1.2 % lysine ) , P3 ( 2.4 % lysine ) and P4 ( 4.8 % lysine ) was significantly different with treatment P0 ( control ). The quality of water for 40 days treatment was set to temperature 27-300C, pH 7.5-8.5, ammonia 4 mg/l and dissolved oxygen 4 mg/l.   Keyword : lysine, protein retention, energy retention, freshwater pompret fish

jurnal ilmiah perikanan dan kelautan/jurnal ilmiah perikanan dan kelautan

Penambahan Lisin pada Pakan Komersial terhadap Retensi Protein dan Retensi Energi Ikan Bawal Air Tawar (Colossoma macropomum) &lt;br&gt;&lt;i&gt;[Lysine Addition on Commercial Feed to the Protein Retention and Energy Retention Colossoma macropomum]&lt;i&gt;