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Fish from a polluted lake(Lake Chivero,Zimbabwe):a food safety issue of concern

Food Quality and Safety 2019年第3期3卷 157-167页

作者： Francis Manjengwa tamuka nhiwatiwa Elijah Nyakudya Petronella Banda Faculty of Science Biosciences DepartmentUniversity of ZimbabwePO Box MP167Mt.PleasantHarareZimbabwe Faculty of Agriculture Soil Sciences&Agricultural Engineering DepartmentUniversity of ZimbabwePO Box MP167Mt.PleasantHarareZimbabwe Faculty of Agriculture Animal Sciences DepartmentUniversity of ZimbabwePO Box MP167Mt.PleasantHarareZimbabwe

Objectives:A study to determine food safety hazard status of fish products from Lake Chivero was conducted in selected high density suburbs of *** water and fish were tested for *** O157:H7,total bacterial,fungal counts,mercury(Hg)and aflatoxin B1(AFB1)to determine contamination levels and assessing human health hazard *** and Methods:Membrane filtration method was used to determine *** O157:H7 viable counts using CHROM *** count and Potato dextrose agar were used for determination of total viable bacterial and fungal *** of Hg and AFB1 in fish and water were determined by Atomic Absorption Spectrophotometer and High Performance Liquid Chromatography-Mass Spectrometry.A questionnaire survey was conducted on 136 adult fish consumers to determine the fish consumption patterns to assess hazard exposure against international ***:Significant levels of microbial contamination above international standards in both fish and water were *** *** O157:H7 counts were 106±10(cfu/cm^(2))in fish and 52±14(cfu/100ml)in *** Log10 TBC were 8.98±0.26(cfu/cm^(2))in fish and 9.05±0.05(cfu/ml)in *** Log10 TFC were 4.83±0.02(cfu/cm^(2))in fish and 4.56±0.03(cfu/ml)in *** and AFB1 were 0.018(μg/kg)and 0.025(μg/kg)in fish and 0.008(μg/kg)and 0.005(μg/kg)in water,both with a hazard quotient(HQ)<1 using CODEX STAN 193-1995 of ***:Fish and water are contaminated with *** O157:H7,contain bacterial and fungal loads above international food safety guidance *** were caught already contaminated with pathogens together with toxigenic Hg and carcinogenic AFB1 although their concentration levels are within international food safety toxicological *** of Hg and AFB1 in water were almost double that of fish,implying bio-accumulation occurred in ***,fish consumers are exposed to food safety hazards and are at risk of contracting foodborne illnesses from consuming contam

关键词： food contamination food safety hazards,E.coli O157:H7,mercury,aflatoxin B1

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