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Different stages of life of an Alaskan red salmon (sockeye, Oncorhynchus nerka). In the ocean (ocean phase) it shows silvery colors, which change dramatically towards reddish after entering rivers for spawning (spawning phase, freshwater phase). Pictures of a real, fresh caught fish were taken in Alaska, ocean phase female on the top, freshwater phase male on the bottom.
Rainbow shark catfish Epalzeorhynchos frenatum aquarium fish isolated on white
Atlantic Cod -  Gadus morhua
A carnivorous freshwater fish that inhabit clear, vegetated lakes, ponds, swamps, and rivers.
Close-up view of a Giant gourami (Osphronemus goramy)
Painted Comber, small seabass grouper fish family Serranus Scriba, of Serranidae family from Mediterranean sea on white wood background
Exotic river fish in the water column
Channa maculata swimming in fish tank. An omnivorous fish that lives in the Mekong Delta is used to feed farmers during floods
fish in a seawater aquarium
Blackspotted rockfish, is a rockfish of the Pacific coast, Seward, Alaska
Gold barb Barbodes semifasciolatus Chinese barb tropical aquarium fish
Perch (Perca fluviatilis)
Silver Carp, hypophthalmichthys molitrix
Goldfish in the aquarium
A Grayling school (Latin name Thymallus thymallus) swim in the river Anton, a UK chalk stream river in southern UK.
The Arctic grayling (Thymallus arcticus) is a species of freshwater fish in the salmon family Salmonidae. T. arcticus is widespread throughout the Arctic and Pacific drainages in Canada, Alaska, and Siberia, as well as the upper Missouri River drainage in Montana.  Wyoming.
Chinook Salmon swimming in water.
Red tailed catfish
The yellow jack, also known as coolihoo, is a species of marine fish in the jack family, Carangidae
Swimming grass snake (Natrix natrix), sometimes called the ringed snake or water snake,
exotic aquarium fish astranatous with close-up
School of Crevalle Jack Fish.
White bream, its scientific name is Blicca bjoerkna
Atlantic Striped Bass  swimming in the aquarium close-up.
there is a fish that is standing up on a white surface.
Transparent Waters of Plitvice Lakes National Park
European Chub Squalius Cephalus fish in river
Trout Fish Caught in Net - View of fish caught in fishing net after being caught fly fishing. Catch and release ethics.
Siberian sturgeon (Acipenser baerii). Wild life animal.
Aquarium tropical fish: otocinclus
Free Images: "bestof:Sockeye breeding male.jpg Oncorhynchus nerka Scanned from plates in cite book Evermann Barton Warren Goldsborough Edmund Lee The Fishes of Alaska Department of"
Male and female red salmon oncorhynchus nerka.jpg
Spawning sockeye red salmon fish.jpg
Sockeye salmon on spawning grounds.jpg
Adult sockeye salmon encounter a waterfall on their way up river to spawn.jpg
Red salmon or sockeye salmon in spawning bed.jpg
Swine flu infection exponent by county June 2009.svg
Madame_Proudhon.jpg
FMIB_49016_Kootenay_Indian_family_at_Moyle_Lake.jpeg
Robert_Lefèvre,_"Claude_Ambroise_Régnier,_Duc_de_Massa"_(1808).jpg
Michał Serwacy Wiśniowiecki.JPG
Sockeye breeding male.jpg
Salmon male.jpg
Sockeye_breeding_female.jpg
Sockeye adult male.jpg
Sockeye_female.jpg
Coho_Salmon_Breeding_Male.jpg
Humpback Salmon Breeding Male.jpg
Dog Salmon Breeding Male.jpg
Plate_XXIV-Humpback_Salmon_Breeding_Male.jpg
Plate_XXVII-Dog_Salmon_Breeding_Male.jpg
PlateXXXII-Coho_Salmon_Breeding_Male.jpg
Salmon_male_spawning_phase.jpg
PlateXXIII-Humpback_Salmon.jpg
Humpback Salmon Breeding Female.jpg
Humpback Salmon Adult Male.jpg
Chinook Salmon Adult Male.jpg
Coho Salmon, Adult Male.jpg
Dog Salmon, Breeding Female.jpg
PlateXXVI-Humpback_Salmon_Breeding_Female.jpg
Plate_XXVIII-Dog_Salmon_Breeding_Female.jpg
PlateXXIX-Chinook_Salmon_Adult_Male.jpg
PlateXXXI-Coho_Salmon_Adult_Male.jpg
Oncorhynchus_clarkii.jpg
Steelhead_Oncorhynchus_mykiss.jpg
Humpback Salmon Adult Female.jpg
PlateXXV-Humpback_Salmon_Adult_Female.jpg
PlateXXX-Chinook_Salmon_Adult_Female.jpg
Salvelinus_malma_malma.jpg
Plate_XLI_-_Alaska_Grayling.jpg
Arctic_Grayling_Thymallus_arcticus_arcticus.jpg
Plate_XLII_-_Red_Rockfish_(Yelloweye_Rockfish).jpg
FMIB_39318_Salmo_clarkii_(Richardson).jpeg
FMIB_39340_Cymatogaster_aggregatus_(Gibbons)_Male.jpeg
FMIB_39939_Breeding_Male_Redfish_(Oncorhynchus_nerka)_Length_24_inches_Alturas_Creek,_Idaho,_September_5,_1895.jpeg
FMIB_39956_Breeding_Male_Redfish_(Oncorhynchus_nerka),_small_form.jpg
FMIB 39385 Megalocottus platycephalus.jpeg.jpg
FMIB_39341_Osmerus_thaleichthys.jpeg
FMIB 39403 Gymnocanthus pistilliger (Pallas).jpeg.jpg
FMIB_39322_Hexagrammos_octogrammus.jpeg
FMIB_39325_Sebastodes_pinniger_(Gill).jpeg
FMIB_39326_Sternias_xenostethus_(Gilbert).jpeg
FMIB_39327_Sebastodes_caurinus_(Richardson).jpeg
FMIB_39328_Icelus_spiniger_Gilbert.jpeg
FMIB_39329_Sebastodes_nigrocinctus_(Ayres).jpeg
FMIB_39330_Sebastodes_brevispinis_(Bean).jpeg
FMIB_39333_Stenodus_mackenzii_(Richardson).jpeg
FMIB_39336_Sebastodes_ciliatus_(Tilesius).jpeg
FMIB_39338_Damalichthys_argyrosomus_(Girard).jpeg
FMIB_39342_Cottus_aleuticus_Gilbert.jpeg
FMIB_39343_Megalocottus_laticeps_(Gilbert).jpeg
FMIB_39344_Myoxocephalus_stelleri_Tilesius.jpeg
FMIB_39347_Dasycottus_setiger_bean.jpeg
FMIB_39351_Melletes_papillo_Bean.jpeg
FMIB_39353_Hexagrammos_stelleri_Tilesius.jpeg
FMIB_39355_Prionistius_macellus_Bean.jpeg
FMIB_39356_Icelus_canaliculatus_Gilbert.jpeg
FMIB_39359_Hypomesus_olidus_(Pallas).jpeg
FMIB_39360_Catostomus_catostomus_(Forster).jpeg
FMIB_39361_Gasterosteus_cataphractus_(Pallas).jpeg
FMIB_39362_Sebastodes_alutus_Gilbert.jpeg
FMIB_39363_Chitonotus_pugetensis_(Steindachner).jpeg
FMIB_39369_Plagyodus_aesculapius_Bean.jpeg
FMIB_39371_Rastrinus_scutiger_(Bean).jpeg
FMIB_39372_Sebastodes_melanops_(Girard).jpeg
FMIB_39374_Hexagrammos_superciliosus_(Pallas).jpeg
FMIB_39375_Radulinus_asprellus_Gilbert.jpeg
FMIB_39376_Gymnocanthus_galeatus_Bean.jpeg
FMIB_39377_Neoliparis_callyodon_(Pallas).jpeg
FMIB_39378_Liparis_cyclostigma_Gilbert.jpeg
FMIB_39380_Sigmistes_caulias_Rutter.jpeg
FMIB_39381_Liparis_herschelinus_Scofield.jpeg
FMIB_39382_Oncocottus_hexacornis_(Richardson).jpeg
FMIB_39383_Ceratocottus_diceraus_(Pallas).jpeg
FMIB_39386_Psychrolutes_paradoxus_Gunther.jpeg
FMIB_39389_Myoxocephalus_axillaris_(Gill).jpeg
FMIB_39390_Libaris_agassizii_Putnam.jpeg
FMIB_39391_Leptocottus_armatus_Girard.jpeg
FMIB_39392_Myoxocephalus_polycanthocephalus_(Pallas).jpeg
FMIB_39394_Lethrotremus_muticus_Gilbert.jpeg
FMIB_39395_Hemilepidotus_hemilepidotus.jpeg
FMIB_39397_Occa_dodecadron_(Tilesius).jpeg
FMIB_39399_Sarritor_frenatus_Gilbert.jpeg
FMIB_39400_Libaris_cyclopus_Gunther.jpeg
FMIB_39401_Oligocottus_maculosus.jpeg
FMIB_39404_Pallasina_barbata_(Steindachner).jpeg
FMIB_39405_Bathyagonus_nigripinnis_Gilbert.jpeg
FMIB_39407_Hemilepidotus_jordani_Bean.jpeg
FMIB_39409_Zesticelus_profundorum_(Gilbert).jpeg
FMIB_39410_Blepsias_cirrhosus_(Pallas).jpeg
FMIB_39411_Myoxcocephalus_niger_(Bean).jpeg
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