Development of optimized artificial diets for enhanced growth of Zophobas atratus larvae

This study evaluates the effects of various artificial diets on the development of Zophobas atratus larvae. Artificial diets containing various concentrations of agar were also investigated for their ability to reduce death rates during the early stages of larval development. Our results indicated that larvae fed artificial diets experienced a slightly longer developmental period but achieved significantly higher weights. Notably, wheat bran + fish meal 6% resulted in the highest weight gain; however, wheat bran + fish meal 6%, wheat bran + fish meal 5% + ginseng leaf 1%, and wheat bran + fish meal 4% + ginseng leaf 2% yielded higher death rates. The diet with 4% agar resulted in the shortest developmental period, whereas that with 3% agar produced the highest weight gain. However, considering death rates, the diet with 2% agar provided the most balanced outcome across developmental time, weight gain, and survival, making it the most suitable diet for Z. atratus larvae. In conclusion, wheat bran + fish meal + agar 2% artificial diet is more suitable for Z. atratus larval development than wheat bran, leading to greater weight gain, shorter development periods, and higher adult emergence rates. Additionally, this diet showed the potential to reduce the dust issues and labor demands associated with wheat bran usage. Our findings suggest that wheat bran + fish meal + agar 2% could be an effective artificial diet for the optimal development of Z. atratus larvae.