Pengaruh Substitusi Tepung Kedelai dengan Tepung Spirogyra sp. dalam Pakan terhadap Sintasan dan Pertumbuhan Ikan Nila (Oreochromis sp.)

Bimo Arkanantiyo Gemilang Permana, Dr. Senny Helmiati, S.Pi., M.Sc.

2026 | Skripsi | BUDIDAYA PERIKANAN

Penelitian ini bertujuan mengetahui pengaruh substitusi tepung kedelai dengan tepung Spirogyra sp. terhadap sintasan dan pertumbuhan ikan nila (Oreochromis sp.). Penelitian menggunakan Rancangan Acak Lengkap dengan empat perlakuan dan tiga ulangan, yaitu P0 (pakan komersial/kontrol), P1 (substitusi tepung kedelai 0?ngan 100% tepung Spirogyra sp.), P2 (substitusi tepung kedelai 50?ngan 50% tepung Spirogyra sp.), dan P3 (substitusi tepung kedelai 100?ngan 0% tepung Spirogyra sp.). Ikan nila berukuran 7–9 cm dipelihara selama 45 hari dengan kepadatan 30 ekor per bak dan diberi pakan sebanyak 5% biomassa per hari dengan frekuensi dua kali sehari. Parameter yang diamati meliputi sintasan, pertumbuhan mutlak berdasarkan bobot dan panjang, laju pertumbuhan spesifik berdasarkan bobot dan panjang, Feed Conversion Ratio (FCR), Protein Efficiency Ratio (PER), serta kualitas air. Data dianalisis menggunakan uji normalitas dan homogenitas, ANOVA pada taraf kepercayaan 95%, serta uji lanjut Dunnett. Hasil penelitian menunjukkan bahwa substitusi tepung kedelai dengan tepung Spirogyra sp. tidak memengaruhi sintasan dan pertumbuhan ikan nila. Akan tetapi, pada perlakuan P2 (substitusi tepung kedelai 50?ngan 50% tepung Spirogyra sp.) menghasilkan nilai FCR dan PER yang lebih baik dari kontrol, yaitu masing-masing 1,89 ± 0,27 dan 1,95 ± 0,27. Dengan demikian, pakan dengan substitusi tepung kedelai 50?ngan 50% tepung Spirogyra sp. adalah efisien dan proteinnya dapat dimanfaatkan oleh ikan nila dengan baik.

This study aimed to determine the effect of substituting soybean meal with Spirogyra sp. meal on the survival and growth of tilapia (Oreochromis sp.). The study used a Completely Randomized Design with four treatments and three replications: P0 (commercial feed/control), P1 (0% soybean meal substitution with 100% Spirogyra sp. meal), P2 (50% soybean meal substitution with 50% Spirogyra sp. meal), and P3 (100% soybean meal substitution with 0% Spirogyra sp. meal). Tilapia measuring 7–9 cm were reared for 45 days at a density of 30 fish per tank and fed 5% of biomass per day at a frequency of twice daily. The parameters included survival rate, absolute growth in weight and length, specific growth rate in weight and length, Feed Conversion Ratio (FCR), Protein Efficiency Ratio (PER), and water quality. Data were analyzed using normality and homogeneity tests, ANOVA at a 95% confidence level, and Dunnett's follow-up test. The results showed that substituting soybean meal with Spirogyra sp. meal did not affect the survival rate and growth of tilapia. However, treatment P2 (50% soybean meal substitution with 50% Spirogyra sp. meal) produced better FCR and PER values than the control, at 1.89 ± 0.27 and 1.95 ± 0.27, respectively. Thus, feed with 50% soybean meal substitution by 50% Spirogyra sp. meal is efficient, and its protein can be well utilized by tilapia.

Kata Kunci : ikan nila, pertumbuhan, sintasan, Spirogyra sp., tepung kedelai