タイ国の漁港及び市場における現地トロ-ル漁船漁獲魚の鮮度〔英文〕

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To clarify the actual situation of freshness of fish at landing plates of Thailand and its change during transportation and marketing, we measured K values of trawl-caught fish at fishing ports and retail markets in four major fishing ports of Thailand, Phuket, Paknam, Songkhla, and Bangkok. The mean K values just after landing differed by fishing ports; we obtained 39.4% at Songkhla, 34.3% at Paknam, and 36.2% at Bangkok, contrasting with a significantly low value of 26.0% at Phuket. The last-named is located on the Andaman Sea side, while others are on the Gulf of Thailand. Levels of K values also fluctuated from boat to boat. Fish landed by fishing boats operating in the Gulf of Thailand which stayed more days at sea for a cruise than fishing boats operating in the Andaman Sea, showed higher K values. The mean K values of fish landed by fishing boat were found to be in a positive correlation with days at sea of the boat, increasing at a rate of 2.2% per day at sea. The mean K values observed at retail markets were 52.3% in Paknam facing the Gulf of Thailand which was significantly higher than 29.0% observed in Phuket located on the Andaman Sea side. Increase in K values during transportation and marketing, from landing to consumers, was revealed to be at a rate of 0.9 to 1.5% per hour. Taking into consideration the high environ-mental air temperature of the tropical country, the rate mentioned above was rather very low. Early progress of bacterial contamination of fish caught in Thailand was suggested by the rise in pH when K values were comparatively low.
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タイ国の漁港及び市場における現地トロ-ル漁船漁獲魚の鮮度〔英文〕

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