J. Technology and Education, Vol.28, No.1, pp.13-16 (2021)

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Evaluation of correction and friction reduction by loach mucus

 

Takakuni TANAKACYuki NASUCYoshiki AKIMOTOCHiroshi SAKAICNatsumi YAJIMAC

Tomoaki KOUYACHisako OOKA and Takashi KUWAHARA

National Institute of Technology, Oyama College

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

National Institute of Technology, Gunma College

(580 Toriba, Maebashi, Gunma, 371-8530 Japan)

Nagaoka University of Technology, Department of Bioengineering

(1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, JAPAN)

 

(Received March 11, 2021; Accepted May 7, 2021)

 

The loach is a popular freshwater fish in Japan. Loaches release mucus that may directly pollute some aquatic fish. When a loach enters the mud, mucus defends the loachfs body surface, providing lubricity. Loach mucus is effective against various types of friction. In this study, we tried to reduce the effect of friction using concentrated loach mucus. Now, analyzing test data, we measured the friction reduction effect of concentrated mucus. Water with mucus was collected three hours after breeding. The breeding water was concentrated using a rotary evaporator after semi-batch diafiltration (UF membrane, M.W. cutoff is more than 300,000). The friction coefficient is measured by the movement of coming and going (friction tester, TRIBOGEAR 14FW). Loach mucus reduced both the static friction coefficient and dynamical friction coefficients. It was suggested that the friction reduction ability of this mucus protected the body of the loach.

Key words: loach mucus / friction / viscosity

 

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