Determination of Suitable Water Salinity and Live Food in The Rearing of Eel (Anguilla bicolor) Fry
Authors: Sutrisno . 
Published: February 2017

<p>This study was conducted to determine suitable water salinity and live food in the rearing of eel, <em>Anguilla bicolor </em>fry. Eel fry in weight of 0.15±0.008 g/tail were reared at controlled tank at density of 2 fish liter<sup>-1</sup> for 42 days. Experiment was devided into two steps. In the first step of experiment, eel fry were reared at different water salinity, i.e., 0; 5; 10 and 15 ppt. Fish were fed on <em>Tubifex</em> at satiation. The best result from the first experiment was then used in the second step of study to examine proper live food for eel fry. Fish were fed on live food (<em>Tubifex</em>, <em>Artemia</em>, or <em>Spirulina</em>) at 10% body weight. Survival rate, specific growth rate and food conversion ratio were observed. The result of experiment showed that survival rate of eel fry reared in water salinity of 5 ppt (100%), 10 (96%) and 15 ppt (97%) was higher (p<0.05) compared to that of 0 ppt (58%). Specific growth rate was also higher (p<0.05) in fish reared in water salinity of 5 (2.33%), 10 (1.65%) and 15 ppt (1.57%) compared to that of 0 ppt (0.022%). Survival rate and specific growth rate of fish at treatment of 5, 10 and 15 ppt were insignificantly different (p>0.05). The best food conversion ratio was also being obtained at treatment of 5 ppt (3.36), followed repectively by 10 ppt (5.11), 15 ppt (5.70) and 0 ppt (21.11). No different survival rate of eel fry by feeding on different live food was obtained. Higher specific growth rate was achieved at feeding of <em>Artemia</em> (2.82% per day), followed respectively by <em>Tubifex </em>(1.85% per day) and <em>Spirulina </em>(0.15% per day). Food coversion ratio in each treatment was 4.42, 2.77 and 134.33, respectively.</p> <p>Keywords: eel, salinity, live food</p> <p> </p> <h5>ABSTRAK</h5> <p>Penelitian dilakukan dengan tujuan untuk mengetahui salinitas air dan jenis pakan alami yang tepat dalam pemeliharaan benih ikan sidat <em>(Anguilla bicolor)</em>. Benih sidat dengan berat rata-rata 0,15±0,008 g/ekor dipelihara selama 42 hari pada wadah terkontrol dengan kepadatan 2 ekor/liter. Penelitian dibagi kedalam dua tahap. Pada tahap pertama benih sidat diperlihara pada media dengan salinitas 0; 5, 10 dan 15 ppt. Pakan alami berupa cacing sutera diberikan secara satiasi. Salinitas terbaik hasil penelitian tahap pertama digunakan pada penelitian tahap kedua untuk mengetahui jenis pakan alami (cacing sutera <em>Tubifex</em>, <em>Artemia</em>, atau <em>Spirulina</em>) yang cocok untuk benih sidat. Pakan diberikan sebanyak 10% bobot tubuh. Paramater yang diamati meliputi sintasan, laju pertumbuhan spesifik dan efisiensi pakan. Hasil penelitian menunjukkan bahwa sintasan benih ikan sidat yang dipelihara pada salinitas 5 (100%), 10 (96%) dan 15 ppt (97%) lebih tinggi (p<0,05) daripada yang dipelihara pada salinitas 0 ppt (58%). Laju pertumbuhan spesifik juga lebih tinggi (p<0,05) pada benih yang dipelihara pada salinitas 5 (2,33%), 10 (1,65%) dan 15 ppt (1,57%) dibandingkan dengan salinitas 0 ppt (0,022%). Sintasan dan laju pertumbuhan spesifik antara perlakuan 5, 10 dan 15 ppt tidak berbeda nyata (p>0,05). Konversi pakan terbaik juga diperoleh pada perlakuan 5 ppt (3,36), diikuti berturut-turut 10 ppt (5,11), 15 ppt (5,70) dan 0 ppt (21,11). Pemberian pakan alami yang berbeda tidak berpengaruh terhadap sintasan benih sidat, tetapi berpengaruh terhadap pertumbuhan. Pemberian <em>Artemia</em> memberikan laju pertumbuhan spesifik tertinggi, yaitu 2,82%/hari, <em>Tubifex </em>(1,85%/hari) dan <em>Spirulina </em>(0,15%/hari). Konversi pakan tiap perlakuan berturut-turut adalah 4,42; 2,77 dan 134,33.</p> Kata kunci: ikan sidat, salinitas, pakan alami