Effect of depuration on microbial load of mangrove oyster ( Crassostrea gasar ) from a polluted creek in Rivers State, Nigeria

Turkish Journal of Aquatic Sciences Pub Date : 2018-01-31 DOI:10.4314/jas.v32i1a.20

A. Okereke, C. Ezeama, O. Davies, C. D. Ezeonyejiaku

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Abstract

The efficiency of depuration in the removal of microbial load in mangrove oyster (Crassostrea gasar) from a polluted creek in Rivers State, Nigeria using a flow-through method with high loading density was evaluated in this study. Depuration experiments were conducted with cartridge-filtered and UV-light using seawater in segregated plastic tanks at a salinity of 30 ‰, pH of 8.0 and temperature of 29.0 °C. The oysters in segregated tanks were taken at intervals of 24, 48, 72 and 96 hours of depuration and analyzed for microbial load (total hetrotrophic bacteria, total fungi counts, hydrocarbon utilizing bacteria and fungi and feacal coliform counts). Results from the two-way ANOVA showed that time, method and season had significant effect on the microbial counts. At different locations, there was significant difference (P 0.05) on total fungi counts, feacal coliforms and hetrotrophic bacteria was recorded. This study depuration method at the different time interval is recommended.Keywords: Cleansing, contaminants, poisoning, food safety, Crassostrea gasar

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净化对尼日利亚河流州一条受污染小溪中红树林牡蛎微生物负荷的影响

本研究对尼日利亚河流州一条受污染的小溪中使用高负荷密度的流水法去除红树林牡蛎(Crassostrea gasar)微生物负荷的效率进行了评估。在盐度为30‰、pH为8.0、温度为29.0℃的隔离塑料池中，采用滤芯过滤和紫外光净化海水。分别于净化后24、48、72和96小时采集分离池中的牡蛎，分析其微生物负荷(异养细菌总数、真菌总数、利用碳氢化合物的细菌和真菌以及粪便大肠菌群数量)。双向方差分析结果显示，时间、方法和季节对微生物数量有显著影响。不同地点的真菌总数、粪便大肠菌群和异养细菌数量差异有统计学意义(P < 0.05)。本研究推荐了不同时间间隔的净化方法。关键词:净化，污染物，中毒，食品安全，长牡蛎

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