fish

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

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)

Atlantic stingray Dasyatis sabina view from above and from below

Grayling Thymallus thymallus

Landscape of a reed bed with a cross section of the water in the forground and showing fish and amphibians living in the water, along with a close up of some microscopic aquatic invertebrates; in the sky hobby hunt for dragonfly and damselfly and swallows fly; otter, bittern, and water vole hide in the margins […]

Smew Mergellus albellus pen and ink illustration of the bird swimming on water

Red throated Diver Gavia stellata looking alert with red throat on show, showing striped head and sharp beak

Kingfisher Alcedo atthis sketch of bird in flight

Dipper eating aquatic invertebrate

Goosander or Common merganser Mergus merganser on a lake with sundew, rocks and a beach in the foreground, scrubby vegetation behind, set in northern Wales uplands.

Grey heron Ardea cinerea quick sketch, standing on one leg in a river

Grey heron Ardea cinerea wading ankle deep in a river with reeds behind

Common kingfisher Alcedo atthis with minnow in its beak, perched on a branch