By observing the amount of DNA of fish released into seawater, the technology to grasp how much fish live in the surrounding area is centered on Tetsushi Yamamoto, a researcher at the Graduate School of Human Development and Environmental Studies, Kobe University. It was developed for the first time in the world by a joint research group of 6 research institutes.This research result obtained by Kobe University, Hokkaido University, Institute of Statistical Mathematics, Kyoto University, Ryukoku University, and Chiba Prefectural Central Museum was published in the US online scientific journal "PLOS ONE" in March 2016.

In the past, capture surveys and measurement surveys using fishfinders were used to understand what kind of organisms live in the sea area, but this is laborious, time-consuming, and requires measurement equipment. There were problems such as the fact that specialized knowledge was essential and the results varied.
On the other hand, a method for determining whether or not a fish to be examined inhabits from the DNA released into seawater together with the mucus secreted by the body has already been reported. In June 2014, a research group led by Dr. Yamamoto examined whether it is possible to clarify the location of fish and the size of its school by combining measurement of the amount of environmental DNA and a DNA fragment proliferation method called "real-time PCR method". ..

One liter of seawater was collected from the surface and bottom of the sea at 47 locations in Maizuru Bay in the northern part of Kyoto Prefecture, and the amount of environmental DNA of horse mackerel contained in it was analyzed. It was found that it was consistent with the distribution judgment and accurately captured the amount of horse mackerel.At the same time, it was proved that this technique is effective even in a wide sea area where the environmental DNA of fish was thought to spread.The survey in Maizuru Bay was conducted over a wide area of ​​about 1 square kilometers, but the work that would take several days for capture and visual survey was completed in 11 hours.

If you know the DNA information of the fish you want to examine with this technology, you will be able to easily determine the presence or absence and amount of habitat in a short time.Furthermore, by applying this new technology, it is expected that the efficiency of investigating the distribution of fish stocks over a long period of time, such as year and season, will be dramatically improved.

Kyoto University

Foster a free academic style based on the spirit of "self-respect for self-weight" and open up a world of creative learning.

With the motto of self-study, we will continue to maintain a free academic style that is not bound by common sense, and develop human resources who have both creativity and practical ability.We provide an inclusive learning space that allows for diverse and hierarchical choices so that students themselves can choose a solid future through valuable trial and error. […]

Kobe University

To an outstanding research university that shines with advanced research and fusion research

Kobe University, which is located in a port city open to the world, has 4 faculties and 10 faculties under the 15 university arts series of "humanities / human sciences", "social sciences", "natural sciences", and "life / medical sciences". It is a comprehensive university with a graduate school, one research institute and many centers. Based on the philosophy of "harmony between science and reality," we have strengths in both the humanities and science fields […]

Hokkaido University

Strong cooperation with industry and regions "Practical science unique to Hokkaido University" leads the world

The origin of Hokkaido University dates back to Sapporo Agricultural College, which was established in 1876.Throughout its long history, we have cultivated the basic principles of "frontier spirit," "cultivating internationality," "education for all," and "emphasis on practical studies."Based on this philosophy, he has a high level of academic background that is internationally accepted, and has accurate judgment and a leader […].

Ryukoku University

"Less Me More We" From your own world to the world of thinking about us.

Ryukoku University has a tradition of more than 380 years and has been conducting education and research activities for the longest time in Japan.A comprehensive university with 3 campuses in Kyoto and Shiga prefectures, with about 10 students studying in 1 faculties and 2 junior college.Since its founding, it has continued to make the "spirit of Jodo Shinshu" the spirit of its founding, "seeking the truth, living in the truth, and revealing the truth [...]

University Journal Online Editorial Department

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