| OPERCULUM | Hard, bony flap protecting a fish's gills (9) |
| ARMADILLO | Animal covered with hard bony plates (9) |
| TEETH | Set of hard, bony, enamel-coated structures in the jaws of most vertebrates used for biting and chewing |
| DORSALFIN | Stabilising appendage on a fish's back (6,3) |
| BRANCHIAL | Of or relating to the gills of an aquatic animal (9) |
| PLASTERED | With "Stewed to the gills", laid it on thick (9) |
| CROSSBILL | Finch hybrid, black and green about the gills |
| QUEASIEST | Greenest around the gills |
| REDMULLET | One looking green about the gills? Quite the opposite! (3,6) |
| SEASNAKES | Reef swimmers with no gills |
| JAMPACKED | Stuffed to the gills |
| OFFCOLOUR | Green around the gills; pale (3-6) |
| TAIL | A posterior extremity, such as a bird's train of feathers, a dog's flag, a fish's caudal fin, a fox's brush, an otter's rudder or a rabbit's scut (4) |
| MERMAID | A mythical siren, water nymph or literal "sea woman", in the form of a beautiful undine with a fish's tail (7) |
| ERRING | Removing a fish's head is making a mistake (6) |
| SCALE | Bony plate on a fish's body |
| SASHIMI | Fish dish? I miss a fish's tail in a stew |
| MERMAIDS | In stories, these have a woman's body and a fish's tail (8) |
| FINLIKE | Resembling a fish's appendage |
| DORSAL | -- fin, found on a fish's back (6) |
