lateral line

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

Three-spined stickleback Gasterosteus aculeatus male with background weed

Three-spined stickleback Gasterosteus aculeatus male

Striped bass Morone saxatilis

Stone fish Synanceia verrucosa camoflauged with its background

Siamese fighting fish Betta splendens battling

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

Samon Salmo salar smolt showing silvery young fish

Samon Salmo salar parr with distinctive markings and red dots

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

Samon Salmo salar hen fish showing silvery irridescence

Samon Salmo salar with watery background

Rudd Scardinius erythropthalmus

Northern pike Esox lucius lurking with background of weeds

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

Grayling Thymallus thymallus

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

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

Fish anatomy diagram simplified exterior and interior cross section view

European bullhead Cottus gobio with background

Eel Anguilla anguilla swimming with weed and background

Diagram of fishing methods

Diagram of different simplified fish shapes

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