- Faeroe Islands
- falcate
- family (taxonomic)
- fanfin
- fang
- fecundity
- female
- ferruginous
- fertilization
- fin
- finray
- fish
- fjord
- flagellibarba
- flagellum
- flagfin
- flap
- flatfish
- FNAM
- foramina
- forehead
- forked fin
- fossa
- fresh water
- frill
- fringebarbel
- fringed
- frost fish
- Fuerteventura Island
- fulcral
- fullonica
- furrow
- fusca
- fusiform
- fusus
- fyllae