Environment
'Super-Invasive' Fish: Environmental DNA Study Reveals Ecosystem Threat
Environmental DNA analysis has revealed a 'super invasive' fish spreading in Miyazaki Prefecture's Oyodo River and threatening native and endangered species.
Read the full story on Japan 2 Earth - 'Super-Invasive' Fish: Environmental DNA Study Reveals Ecosystem Threat
Environmental DNA (eDNA) research out of Kyoto University revealed the rapid proliferation of a super invasive non-native fish species in Japan's natural environment. The species was first confirmed in Japan in 2017. A predatory species native to the Korean Peninsula, the fish poses a significant threat to river ecosystems and their endangered native species. The research team warns of the severity of the situation, urging immediate action to prevent further spread.
eDNA Analysis of River Water
Environmental DNA (eDNA) refers to trace amounts of DNA present in natural environments such as oceans, rivers, air, and soil. In aquatic environments, eDNA originates from the excretions and mucus of resident organisms. By collecting and analyzing seawater or river water, scientists can determine the species living in the surrounding area. Recent advancements in eDNA metabarcoding allow for the identification of multiple species and the size of their communities in a single analysis.
Using this cutting-edge technology, the research team conducted an eDNA survey in the Oyodo River system in Miyazaki Prefecture, focusing on the Korean Perch (Coreoperca herzi). This freshwater fish native to the Korean Peninsula was first detected in the upper tributaries of the river in 2017.
Unlike its Japanese relative (Coreoperca kawamebari), which grows to about 12 cm in length, the Coreoperca herzi can grow up to 30 cm. Its strong carnivorous diet has raised concerns about the fish's impact on the ecosystem.
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(Read the article in Japanese.)
Author: Juichiro Ito
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