Black Soldier Fly Larvae as a Novel Protein Feed Resource Promoting Circular Economy in Agriculture.

This study is a systematic critical review aimed at rigorously evaluating the potential of larvae (black soldier fly larvae, BSFL) as a sustainable protein source for animal feed through a standardized methodological framework. To address the significant challenge posed by the increasing global demand for protein feed to agricultural sustainability, we retrieved relevant studies published between October 2008 and June 2025 from three core databases-PubMed, ScienceDirect, and Web of Science-and conducted study screening and data extraction in accordance with the PRISMA guidelines. BSFL represent a viable alternative, with a high protein content of 40-60% and efficient organic waste conversion capabilities. This systematic review explores the potential of BSFL to replace traditional protein sources such as fishmeal and soybean meal in animal feed, highlighting their advantages in enhancing growth performance, improving gut health, and reducing methane emissions in ruminants. However, there are still critical research gaps, including the need for standardized safety assessments regarding heavy metal accumulation and chitin digestibility. Addressing these challenges through optimized rearing techniques and rigorous safety evaluations will be crucial for scaling up BSFL production and advancing the development of circular agriculture.