Semester of Graduation
Fall 2025
Degree
Master of Science (MS)
Department
School of Plant, Environmental, and Soil Sciences
Document Type
Thesis
Abstract
The progressive culture of environmental sustainability demands manufacturers to reduce their negative social and environmental impact but provides an inadequate framework for innovative solutions to waste issues. Processing waste from shrimp and crab operations often exceeds 40-70% of raw material weight. Current trends of waste disposal to landfills not only pollute coastal ecosystems but also cost processors significant amounts of money. This study evaluated the use of Black Soldier Fly larvae (BSFL) to valorize shrimp and crab shells into protein-rich feed ingredient and nutrient-dense frass through laboratory and commercial-scale trials. In a controlled micro trial, shrimp and crab shells were incorporated into diets at 25%, 40%, 50% and 60% inclusion and compared to a 100% grain-based feed (positive control). Larval survival remained high across treatments, with optimal growth observed at 25% shell inclusion. Larval crude protein (~45% DM) was stable, while crude fat declined and ash increased at higher inclusions. Frass from shell diets were enriched in phosphorus and calcium, highlighting its potential as a fertilizer. A macro trial conducted under near-commercial conditions confirmed feasibility at scale which reflected similar trends in production metrics. Mineral enrichment was notable in both larvae and frass, while heavy metals remained within safety limits. These findings demonstrate that BSFL can efficiently convert seafood waste into marketable feed ingredient and fertilizer products. Moderate inclusion optimizes larval performance, while higher inclusions enhance frass nutrient value. This strategy may offer Louisiana’s seafood industry a sustainable pathway to valorize the waste into valuable commodities. Comprehensive economic analysis and further research on the efficacy and safety of the resulting byproducts are recommended before commercial implementation of this approach.
Date
11-4-2025
Recommended Citation
Upadhyaya, Shristi, "Valorizing Seafood Waste Streams Using Black Soldier Fly Larvae: Implications for Sustainable Agriculture" (2025). LSU Master's Theses. 6232.
https://repository.lsu.edu/gradschool_theses/6232
Committee Chair
Hayes, Michael P.
Student Approval Forms
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Aquaculture and Fisheries Commons, Entomology Commons