Author(s): Mark Bryan Cervantes, Rhea Mae Matitu, Mark June S Consigna, Adrian Deil C Manliclic and Mark Nell C Corpuz

Abstract: This study assessed the population densities and amictic egg occurrence of rotifer (Brachionus rotundiformis, Tschugunoff 1921) cultured in four media enriched with locally available supplements: A (microalgae Chlorella sorokiniana + baker’s yeast), B (microalgae + commercial powdered milk), C (microalgae + vitamin-mineral premix), and D (microalgae only). Researchers applied two feeding schedules, alternate feeding (1) and daily feeding (2) and ran each culture trial for 14 days. Treatment A consistently yielded the highest rotifer densities under both feeding schedules (X_A1=635±141 rotifers ml^-1; X_A2=797±271 rotifers ml^-1), while Treatment D recorded the lowest (X_D1=200±15.1 rotifers ml^-1; X_D2=263±53.2 rotifers ml^-1). Specific growth rates among Treatments A, B, and C (all with enrichments) were statistically comparable, with Treatment A showing the fastest growth. Amictic egg presence consistently exceeded 30% in all samples, indicating healthy culture conditions. Overall, cultures supplemented with enrichments outperformed those fed with pure algae in terms of rotifer growth and reproductive performance.

DOI: 10.22271/fish.2025.v13.i4a.3114

Pages: 35-39  |  991 Views  302 Downloads

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