Efficient and Economic Storage of Salmon Processing Waste as a Prospective Source for High-value Products
Atlantic salmon aquaculture has a crucial position in Newfoundland aquaculture industry. In order to enhance its competitiveness in the global market, the efficient utilization of salmon resources is important. The salmon processing waste is abundant in lipids and have potential to valorize in nutraceutical grade fish oil products. The quality of the oil product is closely related to freshness and quality of the fish materials. If the raw materials are rancid, the quality of the oil products will be inferior. Therefore, it is critical to develop efficient preservation and storage methods which can preserve the quality and freshness of the fish materials without additional high cost to the existing industrial chain. The proposed project will investigate the pretreatment of salmon by-products using three techniques: antioxidant addition, freeze drying and high pressure processing. The pretreated salmon by-products will be stored at different temperatures for up to six months. The effect of the pretreatment methods and storage conditions will be determined based on the physical properties, microbial load and sensory attributes of the by-products in addition to the yield and quality of the extracted oil (peroxide value, p-anisidine value, acid value, fatty acid profile). The potential of acquiring high-quality oil with potential for pharmaceutical and nutraceutical products will be investigated. Production cost for adequate storage of salmon by-products for the extraction of premium-quality oil will be estimated. Completed scale-up recommendation for salmon by-product preservation and fish oil production will be provided.