John Waters / Slow motion clip of a Brown trout (Salmo trutta) breaching to predate an adult Mayfly (Ephemoptera) emerged on the surface, River Kennet, Hungerford, Berkshire, England, UK, June.

John Waters / Slow motion clip of a Brown trout (Salmo trutta) predating an adult Mayfly (Ephemoptera) struggling to take off from water, River Kennet, Hungerford, Berkshire, England, UK, June.

John Waters / Small shoal of Brown trout (Salmo trutta) swimming and feeding in the River Kennet, Berkshire, England, UK, March.

Ingo Arndt / Mass of Sea trout (Salmo trutta trutta) eggs, with embryos visible, Europe.

Ingo Arndt / Sea trout (Salmo trutta trutta) alevin just hatched with full yolk sac, Europe

John Waters / Pair of Brown trout (Salmo trutta) spawning, with others eating eggs, River Kennet, Berkshire, England, UK. March.

John Waters / Pair of Brown trout (Salmo trutta) spawning, with another male trying to fertilise eggs River Kennet, Berkshire, England, UK. February.

Wild Wonders of Europe / Campbell / Female Bottlenosed dolphin (Tursiops truncatus) with sea trout, Moray Firth, Nr Inverness, Scotland, May 2008

Wild Wonders of Europe / Campbell / Female Bottlenosed dolphin (Tursiops truncatus) with calf surfacing, patrolling rip-current searching for salmon / sea trout, Moray Firth, Nr Inverness, Scotland, May 2008

Norbert Wu / Coral Grouper (Cephalopholis miniata) changes color to match surroundings and mood, Red Sea, Egypt

Fred Bavendam / Coral Grouper (Cephalopholis miniata), Andaman Sea, Thailand

Alex Mustard / Bluestreak cleaner wrasse (Labroides dimidiatus) cleans among the sharp teeth of a predatory roving coral grouper (Plectropomus pessuliferus) beneath an overhang on a coral reef. Ras Mohammed National...