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Titill

Microbiology and Spoilage Trail in Nile Perch (Lates niloticus), Lake Victoria, Tanzania

Útdráttur

The microbiological spoilage trail and storage time for iced whole Nile perch (Lates
niloticus) and chilled fillets were studied. Similarly, microorganisms of surface lake water,
bottom sediments and whole Nile perch from fishing grounds in Mwanza gulf was analysed
in phase I. Phase II and III included iced whole Nile perch, laboratory and four
establishments’ chilled fillets, and all were stored at 0-3oC during shelf life study. Hence,
the main goal of the study was to check prevalence of certain human pathogens, main
spoilage organisms and establish shelf life (storage time) as well as effect of short and long
storage of whole Nile perch in ice prior to processing into chilled fillets.
The results showed variable bacteria counts for sediments and Nile perch guts while lake
water results were approximately below method detection limit 0-20cfu/ml. It was
concluded that human pathogens occasionally may be derived from fishing grounds
environments. The average keeping quality (shelf life) in days for iced whole Nile perch,
laboratory and establishments chilled fillets were 26-28; 17; 8-13 days respectively. Shelf
life was short (8 days) for Nile perch fillets produced from long time (17 days) stored
whole Nile perch in ice before processing. In this work, the main spoilage organism’s
composition in spoiled whole Nile perch and chilled fillets may include Shawenella
putrefaciens, Vibrionaceae / Aeromonas, Pseudomonas, and Enterobacteriaceae. For both
sensory/organoleptic (QIM score) assessment and microbiological methods were consistent
while chemical method was not reliable during early storages. Accordingly it was suggested
that the chemical (TVB-N) parameter is not reliable indicator for freshness quality of iced whole Nile perch as well as chilled fillets.

Birting
9.6.2009


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