Studies on the rats and fleas in the harbor areas of Yokohama and Kawasaki : 1 On the harbor side areas

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  • 横浜・川崎港におけるネズミおよびノミの調査研究 : 1 港湾地域の調査
  • 港湾地域の調査
  • コウワン チイキ ノ チョウサ

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The rats and rat-fleas were studied in the harbor side area of Yokohama and Kawasaki ports during the period from 1952 to 1965. Captivity of Rattus norvegicus has been increasing since 1955 and its rate among captured rats became over 75 per cent in recent years. On the contrary, Rattus rattus reduced its captivity after 1955 when its capture rate was highest, 55 per cent, and is below 25 per cent in recent years. Number of fleas collected has been gradually reduced after 1959. Number of Xenopsylla cheopis showed a peak in 1954, has been abruptly reduced, remained 1 specimen in 1962 and disappeared thereafter. Nosopsyllus fasciatus had been increased its number till 1955 and similar number has been collected thereafter. Monopsyllus anisus showed its maximum captivity in 1959, reduced enormously thereafter and no specimen was collected each in 1961 and 1965.

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