Formulation of aqua-feeds for Asian seabass Lates calcarifer containing optimal inclusion levels of SBM and SPC.
Booth MA and Allan GL (2010) Formulation of aqua-feeds for Asian seabass Lates calcarifer containing optimal inclusion levels of SBM and SPC. Final Report submitted to the United Soybean Board (USB) New Uses Committee, USB Project FY2009 SB9463. Industry & Investment NSW, Port Stephens Fisheries Institute, Taylors Beach, NSW, Australia. 66pp.
SummaryThe United Soybean Board (USB; American Soybean Association) contracted NSW Department of Primary Industries to investigate the use of soybean meal and a soy protein concentrate (a high protein product derived by removing oil and carbohydrate from soybeans) in commercial aqua-feeds for Asian seabass Lates calcarifer. This species is commonly known as Barramundi in Australia. Plant protein sources such as soybean meal and soy protein concentrate are regularly used in aquafeeds for many fish species and have become important in the global push to lower the fishmeal content of aquafeeds, particularly in feeds for carnivorous species such as Asian seabass.
The aim of this research was to determine the protein and energy digestibility of soybean meal, soy protein concentrate and a high quality fishmeal by Asian seabass. Digestibility is a relative measure of the amount of protein, energy and other nutrients absorbed by the digestive tract and is one indication of the nutritional value of a feed ingredient. The higher the value, the greater the amount of the nutrient absorbed and the less excreted in the faeces. Our results indicated that the protein digestibility of soybean meal was high (> 83%). In contrast, the energy digestibility of soybean meal fell from 72% to 63% when its inclusion level was increased from 30 to 50% of the diet. The digestibility of protein from soy protein concentrate and fishmeal was similar and close to 95%, however, the dry matter and energy digestibility of soy protein concentrate was significantly lower than fishmeal.
The digestibility values determined in this study were used to construct a feed ingredient data base for Asian seabass. This data base will be used to formulate a variety of experimental aquafeeds for this species that contain high dietary levels of soybean meal and soy protein concentrate. These feeds will be evaluated in a small-scale growth trial to assess the impact of soybean meal and soy protein concentrate inclusion on growth and feed intake.