| English | Danish |
| blue-back herring | canadisk stamsild (Alosa aestivalis) |
| blue-back shad | canadisk stamsild (Alosa aestivalis) |
| blue box | blå kasse |
| blue box | blå boks |
| blue-finned tunny | blue-fin |
| blue-finned tunny | rød tun |
| blue-finned tunny | almindelig tun |
| blue fish | fed fisk |
| blue flying fish | flyvefisk (Exocoetus volitans) |
| blue grenadiers | langhaleslægt (Macruronus spp.) |
| blue grenadiers | langhalearter (Macruronus spp.) |
| blue ling | byrkelange (Molva dypterygia, molva byrkelange) |
| blue lobster | amerikansk hummer |
| blue mackerel | indo-pacifisk makrel (Scomber australasicus) |
| blue-mouth | blåkæft (Helicolenus dactylopterus(Delaroche,1809), \BRF) |
| blue mussel | blåmusling (Mytilus edulis) |
| blue point oyster | amerikansk østers (Crassostrea virginica) |
| blue runner | blå hestemakrel (Caranx crysos, Caranx fusus) |
| blue sea cat | bredpandet havkat (Anarhichas denticulatus, anarhichas latifrons) |
| blue shark | blåhaj (Prionace glauca) |
| blue spotted bream | spidstandet blankesten (Pagellus bogaraveo (Brünnich,1768), Pagellus centrodontus (Delaroche,1809), Pagellus centrodontus (Günther,1859), Pagrus centrodontus, Sparus centrodontus) |
| blue-spotted seabream | blåplettet havrude (Pagrus caeruleostictus, Sparus caeruleostictus, Sparus ehrenbergii) |
| blue whale | blåhval (Balaenoptera musculus) |
| blue whaler | blåhaj (Carcharhinus glaucus, Carcharias glaucus, Prionace glauca, Squalus glaucus) |
| blue whitefish | blåhelt (Coregonus wartmanni) |
| blue whiting | blahvilling (Micromesistius australis, Micromesistius poutassou, gadus poutassou) |
| blue whiting | sortmund (Micromesistius australis, Micromesistius poutassou, gadus poutassou) |
| great blue shark | blåhaj (Carcharhinus glaucus, Carcharias glaucus, Prionace glauca, Squalus glaucus) |
| Southern blue whiting | sydlig sortmund (Micromesistius australis (Norman)) |
