Niph - Ophi
- Niphon
- Niphon spinosus
- niurzgiai
- nivelės
- Niwaella
- Njasos šamai plėšikai
- no-bill garfish
- Nocomis
- Nocomis biguttatus
- Nocomis micropogon
- nodulose gymnast
- Noemacheilus
- Noemacheilus amudarjensis
- Noemacheilus angorae
- Noemacheilus barbatulus
- Noemacheilus brandti
- Noemacheilus conipterus
- Noemacheilus cristatus
- Noemacheilus dorsalis
- Noemacheilus labiatus
- nomeid fishes
- Nomeidae
- nomeids
- Nomeus
- Nomeus gronovii
- nonparasitic brook lamprey
- Norfolkia
- norfolkijos
- Normanichthyidae
- Normanichthys
- Normanichthys crockeri
- Normano botai
- Normano kardinolai
- Normano plokščiagalviai
- Norman’s smooth-head
- Normichthys
- Normichthys operosus
- North American freshwater catfishes
- North American freshwater catfishes
- north Pacific anchovy
