fishing

Atlantic cod Gadus morhua with curved tail 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

Threats to sea turtles on beaches and at sea diagram

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

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 roach Rutilus rutilus

Grayling Thymallus thymallus

View of the river Wye over a still pool with overhanging tree and a little row boat moored by the river bank, distant hills behind

Welsh river landscape looking across a stretch of smooth water to the trees on the opposite bank