rted that collagen or keratin contained in livestock and
fish waste may be converted to useful products by enzymic
hydrolysis, providing new physiologically functional food
materials. Collagens containing yellow tail fish bone and
swine skin wastes were used as raw materials for
production of protein hydrolysates and peptides. These
hydrolysates could be of potential use as food ingredients
(Morimura et al. 2002). Enzymes and bioactive peptides
obtained from fish waste or by-catch and used for fish
silage, fish feed or fish sauce production (Gildberg2004).
Auto-hydrolysis of waste fish viscera to produce peptone
hydrolysates and their use in microbiological media to
support growth and bacteriocin production by lactic acid
bacteria are reported by Vanquez et al. (2004).