Preparation, composition and properties of fish silage produced with post-coagulation sludge

Post-coagulation sludge was added to fish hydrolyzates (silage). Silage was prepared using whole sprats (Spratus spratus). Technology of the process has been modified and sulphuric acid was replaced with phosphoric acid. The objective was to evaluate the quality of produced silage during storage, particularly the changes of peroxide value and amount of free fatty acids in silage fat.