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| English | German |
| four-bearded rockling | Vierbärtelige Seequappe (Enchelyopus cimbrius) |
| four-eyed butterfly fish | Vieraugengaukler (Chaetodon capistratus) |
| four-eyed fish | Vierauge (Anableps anables) |
| four-eyed fishes | Vieraugen (Anablepidae) |
| four-eyed sole | Augenfleckige Seezunge (Microchirus ocellatus) |
| four-fingered threadfin | Indischer Fädler (Eleutheronema tetradactylum) |
| four-horned sculpin | Vierhörniger Seeskorpion (Triglopsis quadricornis) |
| four-horned sculpins | Vierhörnige Seeskorpione (Triglopsis) |
| four-spined sculpin | Vierhörniger Seeskorpion (Triglopsis quadricornis) |
| four-spined stickleback | Amerikanischer Stichling (Apeltes quadracus) |
| four-spined sticklebacks | Stichlinge (Apeltes) |
| four-thread tasselfish | Indischer Fädler (Eleutheronema tetradactylum) |
| four-toothed sparus | Gewöhnlicher Zahnbrassen (Dentex dentex) |