#8148. Records of rat control campaigns in a food market with the largest seafood trading volume worldwide

October 2026publication date
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Journal’s subject area:
Urban Studies;
Ecology;
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Abstract:
Brown rats (Rattus norvegicus) and roof rats (Rattus rattus) are among the most common mammals worldwide. Little is known about the effects of season on rat population size, which is important for understanding rat ecology and/or performing effective rat control campaigns. Tsukiji Market was a metropolitan central wholesale market in Tokyo and was located within 1 km from one of the biggest downtown areas. To control rats in the market, a pest management professional exclusively conducted annual campaigns at two fixed time points for many years. In addition, the pest management professional successfully confined all rats to the market and exterminated them when the market was closed and demolished. We analyzed these records to assess whether this rat population in Tokyo showed seasonal fluctuation and to provide information regarding rat management in a facility located in a downtown area.
Keywords:
Absolute numbers; Black rats; Norway rats; Population size; Seasonal fluctuation

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