ARTICLE FEED & ADDITIVE MAGAZINE February 2025 53 formulations that include alternative protein sources such as soybean meal or other plant ingredients. Despite these distinct feeding strategies, both species face the risk of reduced nutrient absorption and increased waste when feed formulations are not optimized. This is particularly important in freshwater aquaculture systems, where uneaten feed and nutrient waste can accumulate and create environmental challenges due to their closed or semi-closed nature. To mitigate these risks, functional feed additives designed to enhance nutrient digestion, absorption and metabolism have emerged as a practical solution. ROLE OF LYSO-PHOSPHOLIPIDS AS DIGESTIVE AND METABOLIC ENHANCERS Lyso-phospholipids (LPLs) are effective digestive and metabolic enhancers due to their ability to improve feed efficiency and growth performance. LPLs, also known as lysolecithin, are produced through the hydrolysis of lecithin, which removes a fatty acid molecule from phospholipid structures. This modification increases their hydrophilicity, making LPLs highly effective emulsifiers. When incorporated into aquafeeds, LPLs disperse dietary fats, increasing the surface area available for lipase action and enhancing nutrient digestion. Additionally, LPLs improve cell membrane fluidity and permeability, further facilitating the incorporation of active nutrients transporters and therefore nutrient transport across the gut epithelium. Two feeding trials were conducted in freshwater fish species to prove the efficacy of the LPL-based AQUALYSO under different feeding habits and rearing conditions Trial 1. Efficacy of LPL supplementation in high fish meal feed fed to largemouth bass A first trial led by East China Normal University aimed to assess the impact of the LPL-based AQUALYSO (0.03%) on the growth performance, feed conversion efficiency, and fat metabolism of largemouth bass (Micropterus salmoides) fed a fishmeal-based diet (Table 1). This research has been recently published in Aquaculture Nutrition (see references). Control Ingredients (g/kg) 0.03% AQUALYSO Fish meal Chicken meat powder Soybean meal Flour Wheat gluten meal Tapioca starch Soybean oil Fish dissolved pulp Spray-dried blood cells Monocalcium phosphate Premix Cellulose Y2O3 Aqualyso Crude protein Crude Fat Ash 450 50 95 100 50 30 60 50 30 15 10 59.7 0.3 0 519.0 140.0 113.1 450 50 95 100 50 30 60 50 30 15 10 59.4 0.3 0.3 520.0 133.0 112.6 Table 1. Ingredients and proximal composition of experimental feeds of largemouth bass (dry matter).
RkJQdWJsaXNoZXIy MTUxNjkxNQ==