FERMENTASI MENGGUNAKAN RAGI TEMPE SEBAGAI CARA BIOLOGIS PENGAPUNGAN PAKAN IKAN
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Abstract
Rhizopus sp. dikenal sebagai jamur yang digunakan dalam pembuatan tempe kedelai. Fermentasi Rhizopus sp. menyebabkan perubahan kimia dan fisika pada substrat, termasuk daya apung dan stabilitas dalam air. Sifat ini bisa dimanfaatkan untuk membuat pakan ikan apung secara biologis. Dalam penelitian ini, ragi tempe digunakan sebagai agen hayati dalam fermentasi pakan ikan tenggelam komersial dimana periode fermentasi divariasi selama 0, 22, 24, 26, 28, 30, 32, dan 34 jam. Pakan fermentasi yang dihasilkan dikeringkan dengan oven, selanjutnya kualitas fisiknya diukur dan dibandingkan dengan pakan ikan apung komersial (kontrol positif). Hasil penelitian menunjukkan bahwa pakan fermentasi memiliki stabilitas dalam air, daya serap air, dan daya apung yang lebih baik dibandingkan dengan pakan tenggelam komersial. Namun nilai ini masih lebih rendah dibandingkan pakan apung komersial. Oleh karenanya, proses fermentasi menggunakan ragi tempe memiliki potensi untuk diperbaiki lebih lanjut sebagai metode biologis pembuatan pakan ikan apung.
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