Jack Dykinga / The humpback chubs (Gila cypha) amid Grand Canyon wall reflections in the Colorado River near the confluence with the Little Colorado River. Arizona. Vulnerable species.

Michel Roggo / Chubb (Leuciscus cephalus) under ice in frozen river, Aare river, Switzerland 2006

Michel Roggo / Chubb (Leuciscus cephalus) waiting for food at outlet of lake, Croatia, 2005

Michel Roggo / Looking down at Chubb (Leuciscus cephalus) at surface with reflection of bridge, Rhine River, Switzerland, 1993. No release available.

Michel Roggo / Chubb (Leuciscus cephalus) near surface of water waiting for food, Croatia, 2005

Michel Roggo / Chubb (Leuciscus cephalus) waiting near water surface for food, Croatia, 2004

Michel Roggo / Chub fish (Leuciscus cephalus) and Mute swan (Cygnus color) swimming over, Rhine river, Schaffhausen, Switzerland. RUNNER-UP - Wildlife Photographer of the Year 2010.

Wild Wonders of Europe / Roggo / Bream (Abramis brama) and European chub (Leuciscus / Squalius cephalus) shoal in a calm part of the Rhine, Schaffhausen, Switzerland, February 2009. BOOK & WWE OUTDOOR EXHIBITION. Wild Wonders kids bo...

Wild Wonders of Europe / Roggo / European chub (Squalius / Leuciscus cephalus) and Bream (Abramis brama) shoal in calm part of the Rhine, Schaffhausen, Switzerland, February 2009

Wild Wonders of Europe / Roggo / Chub (Squalius / Leuciscus cephalus) sense shoal in a calm part of the Rhine, Schaffhausen, Switzerland, February 2009

Wild Wonders of Europe / Roggo / Chub (Squalius / Leuciscus cephalus) on spawning ground, Trme, Saane river tributary, Canton of Fribourg, Switzerland, May 2009

Wild Wonders of Europe / Roggo / Bream (Abramis brama) and European chub (Leuciscus / Squalius cephalus) shoal in a calm part of the Rhine, Schaffhausen, Switzerland, February 2009

Wild Wonders of Europe / Roggo / Male Zander / Pikeperch (Stizostedion / Sander lucioperca) defending nest, with Chub (Leuciscus cephalus) in the distance, calm part of the Rhine, Schaffhausen, Switzerland, May 2009

Wild Wonders of Europe / Wothe / Chub (Leuciscus cephalus) in shallows of Morske Oko Lake, Morske Oko Reserve, Vihorlat Mountains, Western Carpathians, Eastern Slovakia, Europe, May 2009

Wild Wonders of Europe / Wothe / Chub (Leuciscus cephalus) in shallows of Morske Oko Lake, Morske Oko Reserve, Vihorlat Mountains, Western Carpathians, Eastern Slovakia, Europe, May 2009

Wild Wonders of Europe / Biancarelli / Chub (Leuciscus cephalus) swimming in crystal clear water, Plitvice National Park, Croatia, October 2008

Ernie Janes / Heron (Ardea sp) standing in reeds with freshly caught chub fish (Leucicus cephalus) UK, April.

Robert Thompson / A school of European Chub (Leuciscus caphalus) at the water surface. Plitvice National Park, Croatia, May.

Nature Production / Greater Pied / Crested kingfisher (Megaceryle lugubris) diving for Dark Chub fish underwater, Shiga, Japan

Nick Upton / View of Lake Bohinj from the southern shore at Ribcev Laz with European chub / chubb (Squalius / Leuciscus cephalus) and Mallard duck (Anas platyrhynchos) family and Mallard hybrids swimming in the fo...

Nick Upton / View of Lake Bohinj from the southern shore at Ribcev Laz with European chub / chubb (Squalius / Leuciscus cephalus) and Mallard ducks (Anas platyrhynchos) swimming in the foreground, with the Julian...

Nick Upton / View of Lake Bohinj from the southern shore at Ribcev Laz with European chub / chubb (Squalius / Leuciscus cephalus) swimming in the foreground and the Julian Alps in the background, Slovenia, July 20...

Nick Upton / Dense shoal of European chub / chubb (Squalius / Leuciscus cephalus) swimming in the Krka river and casting sadows on the river bed, Krka National Park, Sibenik, Croatia, July.

Michel Roggo / Chub (Leuciscus cephalus cabeda) adriatic subspecies, europe

Michel Roggo / Chub (Leuciscus cephalus) Europe

Stephen Dalton / Chub fish basking in dappled sunlight in stream, UK

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) and California sea lions (Zalophus californianus) feeding on mixed baitball of Sardines and Pacific chub mackerel (Scomber japonicus) off Baja California, M...

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) with California sea lions and Striped marlin, feeding on mixed baitball of Sardines and Pacific chub mackerel (Scomber japonicus) off Baja California, Mexic...

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) with California sea lions and Striped marlin, feeding on mixed baitball of Sardines and Pacific chub mackerel (Scomber japonicus) off Baja California, Mexic...

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) with California sea lions and Striped marlin, feeding on mixed baitball of Sardines and Pacific chub mackerel (Scomber japonicus) off Baja California, Mexic...

Wild Wonders of Europe / Roggo / Chub (Squalius / Leuciscus cephalus) on spawning ground, Trême, Saane river tributary, Canton of Fribourg, Switzerland, May 2009

Wild Wonders of Europe / Roggo / Chub (Leuciscus cephalus) spawning in shallow water, Sava river, Slovenia, June 2008

Wild Wonders of Europe / Roggo / Chub (Squalius / Leuciscus cephalus) on spawning ground, Sava river, Slovenia, June 2009

Wild Wonders of Europe / Roggo / Chub (Squalius / Leuciscus cephalus) on spawning ground, Sava river, Slovenia, June 2009

Wild Wonders of Europe / Roggo / Mallard (Anas platyrhynchos) ducks feeding on eggs in the Chub (Leuciscus cephalus) spawning ground, Sava river, Slovenia, June 2008

Pete Oxford / Cortez chub (Kyphosus elegans) off Wolf Island, Galapagos Islands

Pete Oxford / Striped chub (Kyphosus analogus) shoal off Wolf Island, Galapagos Islands

Tim Martin / Chub (Leuciscus cephalus) in foreground and Brown trout (Salmo trutta) behind it. River Stour, Kent, UK. June

Nick Upton / Chubb {Squalius / Leuciscus cephalus} in clear waters of Plitvice lakes, Croatia.

Nick Upton / Chubb {Squalius / Leuciscus cephalus} in clear waters of Plitvice lakes, Croatia.

Nick Upton / Young Chubb {Squalius / Leuciscus cephalus} among limestone covered branches and waterweed, Plitvice lakes NP, Croatia.

Nick Upton / Chubb {Squalius / Leuciscus cephalus} in clear waters of Plitvice lakes, Croatia.

Pete Oxford / Cortez Chub (Kyphosus elegans) off Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Striped Chub (Kyphosus analogus) shoal off of Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Striped Chub (Kyphosus analogus) shoal off Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Blue-bronze Chub (Kyphosus analogus) school, Wolf Island, Galapagos Islands, Ecuador

Pete Oxford / Cortez Chub (Kyphosus elegans), Wolf Island, Galapagos Islands, Ecuador

Pete Oxford / Cortez Chub (Kyphosus elegans), Wolf Island, Galapagos Islands, Ecuador

Norbert Wu / Sonora Chub (Gila ditaenia) swimming, Arizona-Sonora Desert Museum, Tucson, Arizona

Martin H Smith / Chub {Leuciscus cephalus} UK, captive

TIM MARTIN / Chub {Leuciscus cephalus} portrait, captive

TIM MARTIN / Bream {Abramis brama} and Chub {Leuciscus cephalus} in River Thames, UK

Jeff Rotman / Brassy Chub (Kyphosus vaigiensis) swimming along coral reef. Egypt, Red Sea

Willem Kolvoort / Two Chub (Leuciscus cephalus) Holland

Willem Kolvoort / Chub (Leuciscus cephalus) Holland

Doug Perrine / Blue sea chub / Topsail drummer fish {Kyphosus cinerascens} Sipadan, Borneo, Malaysia

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) large male swimming to the surface amid schooling Dusky Chubs (Girella freminvillei), Cape Douglas, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Green Sea Turtle (Chelonia mydas) with Sea Chub school, Galapagos Islands, Ecuador

TIM MARTIN / Chubb (Leuciscus cephalus) UK

Nature Production / Striated / Green-backed Heron {Butorides striatus} feeding on Pale Chub fish, Suizenji Park, Kumamoto, Japan, August