Abstract
Quality deterioration of Nile perch iced 0, 3 and 6 h after landing was monitored to determine the effect of delayed icing on
stability during storage on ice. Free fatty acids, volatile nitrogen bases and mesophilic microbial counts increased during the preicing
duration. Delayed icing also increased the rate of lipolysis, degradation of nitrogenous compounds and growth of mesophilic
microbes during subsequent storage on ice and reduced the time required for development of off odours. Psychrotrophic plate
counts were, however, not affected by pre-icing duration. It was concluded that spoilage of Nile perch stored on ice is hastened by
delay to ice and that mesophiles play a more important role in the spoilage of Nile perch, even when stored on ice.
AbstractQuality deterioration of Nile perch iced 0, 3 and 6 h after landing was monitored to determine the effect of delayed icing onstability during storage on ice. Free fatty acids, volatile nitrogen bases and mesophilic microbial counts increased during the preicingduration. Delayed icing also increased the rate of lipolysis, degradation of nitrogenous compounds and growth of mesophilicmicrobes during subsequent storage on ice and reduced the time required for development of off odours. Psychrotrophic platecounts were, however, not affected by pre-icing duration. It was concluded that spoilage of Nile perch stored on ice is hastened bydelay to ice and that mesophiles play a more important role in the spoilage of Nile perch, even when stored on ice.
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