lateral line

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

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

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

Diagram of different simplified fish shapes

Diagram of fishing methods

Eel Anguilla anguilla swimming with weed and background

European bullhead Cottus gobio with background

Fish anatomy diagram simplified exterior and interior cross section view

Fish scales used to age a fish with zoom in annuli of fish scales

Fishing net pingers shown on nets in the sea deterring dolphins (but not fish)

Grayling Thymallus thymallus

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