Project Overview
Commodities
Practices
Proposal abstract:
Largemouth bass (LMB) (Micropterus nigricans) is one of the most economically valuable freshwater species cultured in the Midwest, particularly in Missouri. Its popularity among recreational anglers and increasing demand in food markets make it a prime candidate for aquaculture expansion. However, current LMB production remains highly dependent on fishmeal, an ingredient derived from overexploited wild marine fisheries. This reliance is increasingly unsustainable, as rising fishmeal costs and limited availability threaten both the economic viability and environmental sustainability of aquaculture operations. Identifying locally available, cost-effective, and nutritionally viable alternatives to fishmeal is essential to support the growth of the aquaculture industry in Missouri and the broader North Central Region. This graduate research project evaluates the potential of enzymatically processed Asian carp fish protein hydrolysates (FPHs) as a fishmeal replacement in juvenile LMB diets. Four experimental diets will be formulated, replacing fishmeal with FPH at 0% (control), 33%, 66%, and 100% inclusion levels. These diets will be tested in a 12-week feeding trial using a recirculating aquaculture system (RAS) optimized for water quality and fish health. Performance indicators, including growth rate, feed conversion ratio (FCR), survival, and behavioral observations, will be measured. Physiological responses will also be assessed through serum analysis and gut morphology evaluations. The study will further examine the economic feasibility of FPH inclusion by comparing feed formulation costs and estimating potential savings for producers. Results will help identify the optimal FPH level that supports fish health and growth while minimizing feed costs and dependence on marine fishmeal. Outreach efforts will include producer-friendly fact sheets, presentations at regional conferences, and a peer-reviewed publication. Post-event surveys will assess knowledge transfer, producer feedback, and adoption potential. The anticipated outcomes offer sustainable solutions for aquaculture development and invasive species management in Missouri and beyond.
Project objectives from proposal:
This project aims to support fish farmers, especially those raising LMB in Missouri and the North Central Region, in adopting more sustainable and cost-effective feeding practices. Replacing imported, marine-based fishmeal with fish protein hydrolysates (FPHs) made from invasive Asian carps could help fish farmers lower feed costs while contributing to invasive species management and environmental conservation.
Learning outcomes include increased awareness and knowledge among fish farmers, feed manufacturers, general public, policy makers and academia about the nutritional, economic, and environmental benefits of Asian carp-based FPHs. The target audience will gain skills in comparing feed options, evaluating cost-effectiveness, and understanding how invasive species can be transformed into valuable resources. The project also seeks to foster more positive attitudes toward sustainable feed solutions and the productive use of local, underutilized species.
Action outcomes include farmers and/or feed manufacturers expressing interest in utilizing FPH in fish feeds. Participants are expected to use project findings to make more informed decisions about feed purchases and strategies, potentially reducing dependence on traditional fishmeal. Some may also initiate collaborations with local processors to produce or source Asian carp FPH, encouraging new economic opportunities in the region.
Evaluation methods will include pre- and post-feeding trial surveys to measure changes in knowledge, attitudes, and intent to adopt FPH-based feeds. Follow-up surveys and direct feedback from farmers will help assess actual changes in feeding practices and identify measurable outcomes such as cost savings, improved fish health, or new business partnerships.