輸入冷凍エビの衛生微生物学的研究
1975 年 41 巻 6 号 p. 667-674
詳細
1975 年 41 巻 6 号 p. 667-674
A microbiological evaluation of 22 samples of frozen shrimps imported from tropical areas was undertaken with results as follows:
1. Total aerobic plate counts determined at 37°C (mesophiles) were found to range from 6.2×102 to 2.3×105/g, except one sample showing as much as 107/g. In contrast, those counts determined at 25°C (psychrophiles) were 2 to 1000 times higher than those of mesophiles.
2. Caliform organisms could be detected only in one sample, while enterococci were detected in 9 out of 12 samples. As to volatile basic nitrogen contents, 8 out of 22 samples contained more than 30mg/100g,
3. It was noted that more than 70% of either aerobic mesophiles in 17 samples or psychrophiles in 14 samples consisted of Gram-positive bacteria, the most predominant organisms belonging to Micrococcus-Streptococcus, Staphylococcus or Microbacterium-Corynebacterium. On the other hand, Gram-negative bacteria isolated were rather few in number, and the majority of these isolates were found to belong to Flavobacterium-Cytophaga, Pseudomonas, Moraxella and Acinetobacter.
4. No specific or close relationship could be observed between the microflora of the shrimp samples and their respective producing areas.
