swol - thor
- swollen-headed conger
- swordfish
- swordfishes
- swordfishes
- swordspine snook
- swordtails
- Syacium
- Syacium micrurum
- Sydney whiting
- sykai
- sykinės
- sykinės plėšikės
- Symbolophorus
- Symbolophorus californiensis
- Symbolophorus rufinus
- Symbolophorus veranyi
- Symphodus
- Symphodus mediterraneus
- Symphodus melops
- Symphodus ocellatus
- Symphodus tinca
- Symphorichthys
- Symphorichthys spilurus
- Symphorus
- Symphorus nematophorus
- Symphurus
- Symphurus ligulatus
- Symphurus nigrescens
- Symphurus ocellatus
- Symphurus plagiusa
- Symphysanodon
- Symphysanodon typus
- Symphysanodontidae
- Symphysodon
- Symphysodon aequifasciata axelrodi
- Symphysodon aequifasciata haraldi
- Symphysodon discus
- Sympterygia
- Sympterygia bonaparti
- Synagrops
