著者

村上 哲生 矢口 愛

出版者

名古屋女子大学

雑誌

名古屋女子大学紀要. 家政・自然編 = Journal of Nagoya Women's University. Home economics・natural science (ISSN:09153098)

巻号頁・発行日

vol.55, pp.79-84, 2009-03

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Stenopsyche marmorata Navas(Trichoptera, caddis fly)larvae boiled down in soy sauce are commonly eaten in the Ina District, Nagano Prefecture, Central Japan. The origin and habit transition of eating aquatic insects("Zazamushi")are introduced in this paper. The term "Zazamushi" originally referred to larvae of the stone fly Plecoptera). Eutrophication of Lake Suwa, the water head of the Tenryu River that flows through Ina Valley, has caused shifts in dominant riverine insect species from stone flies to net spinning caddis flies since the 1930s. The benthic community of riffles in the Tenryu is now dominated by net spinning caddis flies such as S. marmorata and Hydropsyche sp., the biomass of which reaches 4 gm-2 in dry weight. The large biomass, supported by the supply of particulate organic matter from Lake Suwa, has made it possible to commercialize canned "Zazamushi". The products available now are mostly composed of S. marmorata larvae(98%)and a small atio of other aquatic insects.