Translation guide
An invasive species is a non-native organism that causes harm to the environment, economy, or human health. This guide covers how to express this concept in Japanese, from formal ecological terms to everyday expressions.
The standard scientific and policy term for an invasive species.
The most direct and formal term, used in official documents, research, and environmental policy. Literally 'invasive alien species'.
侵略的外来種は在来種に深刻な影響を与える。
Invasive species have a serious impact on native species.
Legal term under Japan's Invasive Alien Species Act. Refers to designated invasive species that are regulated.
アライグマは特定外来生物に指定されている。
Raccoons are designated as an invasive alien species.
General term for 'alien species' or 'non-native species'. Not all外来種 are invasive; context is needed to imply harm.
外来種の中には生態系に悪影響を及ぼすものもある。
Some alien species have a negative impact on the ecosystem.
Expressions used in general conversation or media when talking about harmful non-native species.
A slightly less formal phrase that combines 'alien' and 'invasive'. Common in news articles.
外来の侵略種が急増している。
Invasive alien species are rapidly increasing.
Descriptive phrase meaning 'alien species that destroy the ecosystem'. Used when explaining the concept to a general audience.
生態系を壊す外来種の駆除が進められている。
Efforts are underway to eradicate invasive species that destroy the ecosystem.
Very simple ways to refer to invasive species in casual conversation, often with a negative nuance.
Means 'troublesome alien species'. Conveys the nuisance aspect without technical jargon.
この池には厄介な外来種がたくさんいる。
This pond is full of troublesome invasive species.
Literally 'alien species that have increased too much'. Focuses on overpopulation.
増えすぎた外来種が在来種を追いやっている。
Overpopulated invasive species are driving out native species.
外来種 (alien species) is a neutral term for any non-native species, regardless of impact. 侵略的外来種 specifically means invasive species that cause harm. In English, 'invasive species' always implies harm, so be careful not to use 外来種 alone when you mean invasive.
外来種すべてが侵略的というわけではない。
Not all alien species are invasive.
The direct translation '侵入種' (しんにゅうしゅ) is rarely used and may not be understood. Stick to the established terms above.