Cyril Ruoso / Mute swan (Cygnus olor) feeding along riverbed, viewed underwater, Burgundy, France. November.
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John Waters / Pair of Sea lampreys (Petromyzon marinus) spawning, one attempting to move a rock, River Wye, UK, June.
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John Waters / Small group of Rainbow trout (Oncorhynchus mykiss) swimming in the River Kennet, Berkshire, England, UK, March.
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John Waters / Small shoal of Brown trout (Salmo trutta) swimming and feeding in the River Kennet, Berkshire, England, UK, March.
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John Waters / Shoal of Minnows (Phoxinus phoxinus) swimming and feeding in the River Wye, Wales, UK, July.
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Franco Banfi / Aquatic plants growing on bottom of the main spring at Rio Sucuri, Bonito, Mato Grosso do Sul, Brazil
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Franco Banfi,Franco Banfi / Piraputanga (Brycon hilarii) in the main spring AquaĦrio Natural that goes in the Rio Baia Bonita, Bonito, Mato Grosso do Sul, Brazil
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Franco Banfi / Piraputanga (Brycon hilarii) reflecting on the water surface, AquaĦrio Natural, Bonito, Mato Grosso do Sul, Brazil
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Michel Roggo / Brown bear (Ursus arctos beringianus) fishing for Sockeye salmon in the Ozernaya River, Kamtchatka, Russia, August
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Alex Mustard,Alex Mustard / A female (in front) and male Sockeye salmon (Oncorhynchus nerka) over eggs in their spawning river. Adams River, British Columbia, Canada, October.
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Linda Pitkin / 2020VISION / Brown trout (Salmo trutta) fry on river bed, Cumbria, England, UK, September.
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Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration; males surrounding a female. Adams River, British Columbia, Canada, October.
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Etienne Littlefair / Northern snapping turtles (Elseya dentata), small adult at rest amongst woody debris at the bottom of a deep creek bed in the Daly region, Northern Territory, Australia. June. Cropped.
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Etienne Littlefair / White-throated snapping turtle (Elseya albagula), adult female with cataracts, found active, walking along the bottom of a rocky area in the Connors River, Queensland, Australia. August.
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Etienne Littlefair / White-throated snapping turtle (Elseya albagula), large adult female with cataracts, found active, walking along the bottom of a deep pool in the upstream of the Mary River, Queensland, Australia. Aug...
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Etienne Littlefair / Broad-shelled turtle (Chelodina expansa), adult actively moving along deep river bed, possibly foraging, Mary River, Queensland, Australia. July. Cropped.
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Etienne Littlefair / Fitzroy river turtle (Rheodytes leukops), adult actively moving along the riverbed, Connors River, Queensland, Australia. August.
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Etienne Littlefair / Fitzroy river turtle (Rheodytes leukops), adult actively moving along the riverbed, Connors River, Queensland, Australia. August. Cropped.
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Etienne Littlefair / Fitzroy river turtle (Rheodytes leukops), adult actively moving along the rocky riverbed, Connors River, Queensland, Australia. August.
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Etienne Littlefair / Mary river turtle (Elusor macrurus), full-sized adult male with alge-covered carapace heading for shelter under a fallen log, Mary River, Queensland, Australia. August.
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Etienne Littlefair / Mary river turtle (Elusor macrurus), full-sized adult male walking along deep riverbed, Mary River, Queensland, Australia. August. Cropped.
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Etienne Littlefair / Mary river turtle (Elusor macrurus), adult male walking along riverbed, with algae attached to his head, Mary River, Queensland, Australia. August. Cropped.
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Etienne Littlefair / Mary river turtle (Elusor macrurus), juvenile resting, well-camouflaged, Mary River inland of Cambroon, Queensland, Australia. August.
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Etienne Littlefair / Krefft's river turtle (Emydura macquarii krefftii), juvenile with carapace covered in algae, actively moving along riverbed of the Mary River, Queensland, Australia. August.
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Etienne Littlefair / Krefft's river turtle (Emydura macquarii krefftii), adult actively moving along riverbed of the Mary River, Queensland, Australia. Cropped.
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Etienne Littlefair / Gulf snapping turtle (Elseya lavarackorum), large adult female found active in deep water on a very hot summer night, Lawn Hill Creek, Queensland, Australia. January. Cropped.
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Etienne Littlefair / Irwin's turtle (Elseya irwini), juvenile resting downstream of a riffle zone, North Johnstone River, downstream of Malanda, Far North Queensland, Australia. August. Cropped.
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Etienne Littlefair / Irwin's turtle (Elseya irwini), juvenile swimming through submerged vegetation downstream of a riffle zone, North Johnstone River, downstream of Malanda, Far North Queensland, Australia. August. C...
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Etienne Littlefair / Irwin's turtle (Elseya irwini), adult male resting. Note the sediment disturbance to the rear of the turtle is caused by expulsion of water via cloacal respiration. North Johnstone River, downstre...
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Etienne Littlefair / Irwin's turtle (Elseya irwini), large adult female found actively moving around in a deep pool of the North Johnstone River, downstream of Malanda, Far North Queensland, Australia. August. Cropped...
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Etienne Littlefair / Sandstone long-necked turtle (Chelodina burrungandjii) actively foraging at night, Pentecost River, Western Australia. April.
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Etienne Littlefair / Saw-shelled turtle (Myuchelys latisternum), adult female resting, Townsville region, Queensland, Australia. September. Cropped. NOTE: some backscatter caused by photographer has been cloned out.
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Ann & Steve Toon / Elephant (Loxodonta africana) in Shingwedzi river bed, Kruger National Park, South Africa.
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Remi Masson / Group of Wels catfish (Silurus glanis) a tthe bottom of a river. River Loire, Indre-et-Loire, France. October.
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Remi Masson / Group of Wels catfish (Silurus glanis) at the bottom of a river. River Loire, Indre-et-Loire, France. October.
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Remi Masson / Giant wels catfish (Silurus glanis), longer than two meters, swimming above the bottom of the lake of Neuchatel, Switzerland.
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Remi Masson / Common toads (Bufo bufo) in mating ball, Ain, Alps, France, April.
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Robert Thompson / La Fraucata and Arazas River, Valle De Ordesa, Ordesa National Park, Spain. October 2019.
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Robert Thompson / La Fraucata and Arazas River, Valle De Ordesa, Ordesa National Park, Spain. October 2019.
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Robert Thompson / La Fraucata and Arazas River, Valle De Ordesa, Ordesa National Park, Spain. October 2019.
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Orsolya Haarberg / Aerial view of an Arctic riverbed with sand banks and islands. Tana River, Norway. July.
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Paul Hobson / White-clawed crayfish (Austropotamobius pallipes) on riverbed, Staffordshire, UK. September.
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Paul Hobson / White-clawed crayfish (Austropotamobius pallipes) on riverbed, Staffordshire, UK. September.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species. On riverbed in woodland. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species, on riverbed. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species, on riverbed in woodland. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Paul Hobson / Signal crayfish (Pacifastacus leniusculus) on river bed near bridge, split level image. River Rivelin, Sheffield, England, UK. September 2018.