noun-modifying (irregular)
marine; sea-dwelling
Prenominal adjective used in biological or ecological contexts to describe organisms that live in the sea.
海生哺乳類にはクジラやイルカが含まれる。
Marine mammals include whales and dolphins.
この水族館では海生生物の多様性を紹介している。
This aquarium introduces the diversity of marine life.
Compound of 海 (sea) and 生 (life/living), literally 'sea-living'. The alternate form 海棲 uses 棲 (to dwell) with a similar meaning.