fins

Flipper of Humpback whale Megaptera novaeanglicae showing tubercles

Humpback whale Megaptera novaeanglicae shown side on. Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books)

Trout swimming Salmo trutta seen from above on a sandy river bottom, demonstrating carangiform movement

Quick watercolour sketch of the Harbour porpoise Phocoena phocoena cut to whtie

Samon Salmo salar parr with distinctive markings and red dots

Samon Salmo salar smolt showing silvery young fish

Sandbar shark Carcharhinus plumbeus

Sandtiger shark Carcharias Taurus

Seahorse family diagram showing pipefish, leafy seadragon, and other syngnathidae

Siamese fighting fish Betta splendens battling

Stone fish Synanceia verrucosa camoflauged with its background

Striped bass Morone saxatilis

Three-spined stickleback Gasterosteus aculeatus male

Three-spined stickleback Gasterosteus aculeatus male with background weed

Zebra shark Stegostoma fasciatum

Rudd Scardinius erythropthalmus

Samon Salmo salar with watery background

Samon Salmo salar hen fish showing silvery irridescence

Samon Salmo salar hen, cock, parr, and smolt stages with text

Diagram of different simplified fish shapes

Diagram of fishing methods

Eel Anguilla anguilla swimming with weed and background

Elasmobranch (Rays, Dogfish, skates and Sharks) egg case variety

Electroreception in the Hammerhead Sphyrnidae shark diagram with inset of ampullae of Lorensini and hidden prey