ISSUE FOCUS FEED & ADDITIVE MAGAZINE August 2024 59 David Poppi Senior Researcher Skretting AI Ramón Fontanillas Principal Researcher Skretting AI Precision nutrition has received a great deal of recent attention in the aquaculture nutrition field, and for very good reason. The rapid expansion of the aquaculture industry has created pressures in a number of areas in which feed formulation and production play a key role, including a greater focus on reducing the environmental impact of these operations. This is particularly true for the growing recirculating/closed aquaculture system (RAS/CAS) sector, where release of nutrients to the environment is strictly monitored. Reduction of nutrient release from these systems can be achieved by optimisation of biological and mechanical filtration systems or through improved efficiency of removal of solid waste to sludge collection systems. Expansion of filtration system capacity, however, is energy and space intensive. Improvements in removal of undigested nutrients bound in faecal waste in salmonid CAS has been achieved in recent years through the use of faecal binders, such as in Skretting’s CAS-specific product lines. Reduction of dissolved nutrients in the system can also be accomplished via nutritional intervention, through improvement of the efficiency of retention of ingested nutrients. It is this approach which forms the basis of Skretting’s new feed formulation concept AmiNova. It is well documented that animals have a requirement for individual amino acids, and not for protein as a whole. In addition, determination of protein requirements is highly dependent on the use of a balanced digestible amino acid profile and is thus easily confounded by raw material choice and variation in- “It is well documented that animals have a requirement for individual amino acids, and not for protein as a whole. In addition, determination of protein requirements is highly dependent on the use of a balanced digestible amino acid profile and is thus easily confounded by raw material choice and variation inherent with formulation to varying total or digestible protein in dose response studies.” DO DIETARY NITROGEN TARGETS STILL MAKE SENSE IN AQUACULTURE DIETS?
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