Enhancing Artificial Feed Quality for the White Snapper (Lates calcarifer) through Mixed Microorganisms as Pre-Digestion Agents: Effects on Hydrolysis Degree, Soluble Protein, and Glucose Content

Abstract

The reliance on natural feeds such as rotifers and Artemia in the larval rearing of the white snapper (Lates calcarifer) often leads to nutritional deficiencies and elevated operational costs. This study aimed to investigate the impact of mixed microorganisms specifically Bacillus sp, Aspergillus sp., Rhizopus sp., Saccharomyces sp., and Lactobacillus sp., as pre-digestion agents to improve the nutritional profile of artificial feed. A factorial experiment was conducted with varying microbial doses (5, 10, and 15mL/ kg) and incubation durations (6, 12, 18, and 24 hours). The results revealed that the optimal treatment of 10mL/ kg, with an incubation period of 18 hours, significantly enhanced protein content, reduced crude fiber levels, and increased glucose concentrations, thereby improving nutrient digestibility. The microbial hydrolysis process not only elevated protein solubility but also facilitated lipid metabolism while decreasing anti-nutritional factors. These findings suggest that microbial pre-digestion is a promising strategy to enhance the efficiency and sustainability of artificial feed in aquaculture.

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