lateral line

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

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

Samon Salmo salar parr with distinctive markings and red dots

Samon Salmo salar smolt showing silvery young fish

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

Northern pike Esox lucius lurking with background of weeds

Brown trout Salmo trutta from chalk stream (with red spots)

Brown trout Salmo trutta view from above showing swimming motion with background of weeds and pebbles

Common bream Abramis brama

Common carp Cyprinus carpio

Common roach Rutilus rutilus

Comparison of the teeth of different shark species including megalodon, great white, sandtiger, brown, cow, nurse, zebra, and sharpnose shark

Diagram of different simplified fish shapes

Diagram of fishing methods

Eel Anguilla anguilla swimming with weed and background

European bullhead Cottus gobio with background