Substrate Composition Modulates Agri-Food Waste Bioconversion by Yellow Mealworm (Tenebrio molitor) Larvae Under...

Area of Science:

• Insect science
• Sustainable agriculture
• Waste management

Background:

• Yellow mealworm (Tenebrio molitor) larvae are effective bioconverters of organic waste.
• Substrate composition and feeding strategies significantly impact larval performance and product quality.

Purpose of the Study:

• To evaluate the bioconversion efficiency of yellow mealworm larvae fed various organic wastes.
• To assess the impact of different substrates on larval growth, nutritional composition, and safety.

Main Methods:

• Larvae were fed vegetable wastes, okara-wheat-bran diets, and kitchen waste-wheat-bran mixtures.
• Key performance indicators included waste reduction (WR), bioconversion rate (BCR), feed conversion efficiency (FCE), and pupal output.
• Proximate composition and heavy metal content (Arsenic) were analyzed.

Main Results:

• Potato waste yielded high WR (95.18%) and good BCR/FCE; pumpkin waste maximized pupal output.
• In okara diets, 40% okara maximized WR, 10% okara maximized FCE, and 20% okara maximized pupal output.
• Kitchen waste increased larval fat content but also arsenic levels, particularly in higher inclusion mixtures.

Conclusions:

• Substrate choice critically influences yellow mealworm bioconversion efficiency and product nutritional profile.
• Optimizing substrates requires balancing conversion efficiency with product quality and safety, especially regarding heavy metals.
• Further research is needed to fine-tune diets for enhanced sustainability in insect farming.