J.Technology and Education, Vol.32, No.1, pp.12-17 (2025)
研究論文

アメリカザリガニ第一胸脚の鋏力の測定

 

田中 孝国^*，岡山 貴紀，朴本 尚哉

小山工業高等専門学校　物質工学科 (〒323-0806 小山市中久喜771)

*tanakatakakuni@oyama-ct.ac.jp

 

Measurement of the shear strength of the first thoracic leg of the American crayfish

 

Takakuni TANAKA, Koki OKAYAMA, and Naoya BOKUMOTO

National Institute of Technology, Oyama College

(771 Nakakuki, Oyama City, Tochigi 323-0806, JAPAN)

 

(Received April 4, 2025; Accepted May 12, 2025)

 

The American crayfish is widely known as an ecosystem-destroying organism and is designated as a conditionally invasive alien species. There has been much research on how to exterminate crayfish and how to effectively use them after extermination. Focusing on the crayfish’s scissors structure and pinching force, we considered the development of small medical instruments (forceps, etc.) for surgical procedures. Scissors have a complex structure, and their relationship to body weight and other factors is unknown. In this report, we measured the shear force of crayfish scissors. The results showed that male crayfish had scissor forces more than 110 times greater than their body weight. Female crayfish could not be measured with the same sensor as males. The high shear force of crayfish scissors suggested that the scissors could have applications in areas requiring strong localized force.

Key words: American crayfish, Procambarus clarkii, sheer strength, first thoracic leg