trout

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

Mayfly Ephemera vulgata adult side view showing wing venation with markings, green body, and lack of mouth parts Perched on a stem, cut to white

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

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

Wetland chalk meadow with stream running through it, flooded meadow withflowers and wild vegetation on the banks

Wetland chalk meadow with stream running through it, flooded meadow withflowers and wild vegetation on the banks and a willow tree leaning across the stream