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 / Female Grayling (Thymallus thymallus) pursued by several males, 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.

Ann & Steve Toon / Atlantic salmon (Salmo salar) leaping on upstream migration, River Tyne, Hexham, Northumberland, UK, November

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) mother watching cub catching salmon, Katmai National Park, Alaska, USA, August

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) cubs with salmon, Katmai National Park, Alaska, August. Small reproduction only.

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) cubs with salmon, Katmai National Park, Alaska, August. Small reproduction only.

Will Watson / Atlantic salmon (Salmo salar) leaping a weir, Shrewsbury, River Severn, Shropshire, England, UK. November.

Charlie Summers / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) catch, Anan Creek, Alaska, July.

Michel Roggo / Brown bear (Ursus arctos beringianus) fishing for Sockeye salmon in the Ozernaya River, Kamtchatka, Russia, August

Graham Eaton / Salmon / Trout fish (Salmo sp) jumping a waterfall on the Afon Lledr, Betws Y Coed, Wales, October