Charlie Summers / Spawning Arctic grayling (Thymallus arcticus) male (far side) and female are in the act of spawning over a redd or hole in a stream that allows the roe of the female and milt of the male to mix without being washed away. North Park, Colorado, USA, June.
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Alex Hyde / Butterfish / Gunnel (Pholis gunnellus) against white background. From the Isle of Skye, Inner Hebrides, Scotland, UK.
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Linda Pitkin / 2020VISION / Butterfish (Pholis gunnellus) on Dead-man's fingers (Alcyonium digitatum), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, August 2011
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Alex Mustard / 2020VISION / Butterfish (Pholis gunnellus) beside Sea urchin (Echinus esculentus) Loch Carron, Ross and Cromarty, Scotland, UK, April
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Alex Mustard / 2020VISION / Butterfish (Pholis gunnellus) Loch Carron, Ross and Cromarty, Scotland, UK, April
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Graham Eaton / Butterfish / Gunnell (Pholis gunellus) in rockpool habitat. Cardigan Bay, Wales, April.