The increase in fish feed demands caused extra fee. Hence it needs to be done diversification of fish feed. Silage are food additives which function as attractants to increase appetite. Sumpil (Faunus ater) are abundance mangrove pests that contain protein. This study aims to utilize sumpil silage as fish food attractant and increase its protein content. Silage was made by mixing sumpil meat and acid of sauerkraut. Silage was incubated for 0, 4, 7, and 11 days and then measured levels of protein with Lowry-Folin method. The highest levels were found in silage of 7 days incubation, which is 153.99 mg/mL. The highest protein level silage mixed with the fish feed. Red tilapia maintained for 3 weeks and was given five treatments and three replications, namely feed A (high protein), feed B (protein medium), feed B+silage 1%, feed B+3% silage, and feed B+silage 5%. The parameters observed were body weight and body length after feed treatment. The results showed that the average weight of fish treatmented by feed B+silage 1% and 3% are greater than the treatment of feed B only but not greater than the treatment of feed A, although the difference was not significant. While the average length of fish relatively the same. On the other hand most rapid response was found in fish treated with feed B+silage 5%. Based on the results, sumpil silage are potential as attractant that could increase fish productivity.
Keywords: Silage, sumpil, feed, attractants, protein