Redtail catfish Phraclocephalus hemioliopterus resting on the bottom of Illuminated Aquarium Danuri Aquarium Danyang city Korea

redtail catfish catfish phractocephalus hemioliopterus phractocephalus fish danuri aquarium hemioliopterus fin redtail bottom aquatic large habitat animal big aquarium predatory eye reef underwater wildlife danyang ecological swim zoology ecology eyes dwelling fauna wild wild animal environment dark amazon beautiful water face ocean marine solo white single nature peaceful educational inside deep red tropical