Colo - Cten
- Coloconger
- Coloconger raniceps
- Colocongridae
- Cologrammus
- Cologrammus flavescens
- Cololabis
- Cololabis saira
- Colomesus
- Colomesus psittacus
- Colossoma
- Colossoma bidens
- Columbia transmontanus
- Comephoridae
- Comephorus
- Comephorus baicalensis
- Comephorus dybowskii
- Conger
- Conger cinereus
- Conger conger
- Conger japonicus
- Conger myriaster
- Conger oceanicus
- Conger verreauxi
- Conger wilsoni
- Congiopodidae
- Congiopodus
- Congiopodus spinifer
- Congiopodus torvus
- Congocharax
- Congocharax olbrechtsi
- Congopanchax
- Congopanchax brichardi
- Congothrissa
- Congothrissa gossei
- Congresox
- Congresox talabon
- Congresox talabonoides
- Congridae
- Congrina
- Congrina thysanochila
