Specifications include, but are not limited to: Five experimental diets containing various levels of protein and the amino acid lysine. The experimental diets to be purchased will be used in pond studies to evaluate cost-effective diet formulations to complete our federal funded research project. Information obtained from the study will be used by the catfish industry to reduce feed cost and improve farm profit. The experimental diets will be made in small batches (1,500 pounds), and fresh batches will be made as needed, which do not require long-term storage to minimize nutrient loss and mold growth during the hot summer. Also, all experimental diets should be prepared by the same feed mill to ensure that the diets are made using the same processing equipment and conditions throughout the catfish production season so that it will not affect the study results.