iBlue Walleye (Blue Pike)
Conservation status
Extinct (1965)
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: Percidae Genus: Sander Species: S. vitreus Subspecies: S. v. glaucus
Trinomial name
Sander vitreus glaucus

The blue walleye (Sander vitreus glaucus), previously erroneously called the blue pike, was a subspecies of the walleye that went extinct in the 1960s. Until the middle of the 20th century, it was a commercially valuable fish with about a half million tonnes being landed during the period from about 1880 to the late 1950s, when the populations collapsed. The conservation status of a species is an indicator of the likelihood of that species continuing to survive. ... 1965 (MCMLXV) was a common year starting on Friday (the link is to a full 1965 calendar). ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Subkingdom Parazoa Porifera (sponges) Subkingdom Agnotozoa Placozoa Orthonectida Rhombozoa Subkingdom Metazoa Radiata Cnidaria Ctenophora - Comb jellies Bilateria Protostomia Acoelomorpha Platyhelminthes - Flatworms Nemertina - Ribbon worms Gastrotricha Gnathostomulida - Jawed worms Micrognathozoa Rotifera - Rotifers Acanthocephala Priapulida Kinorhyncha Loricifera Entoprocta Nematoda - Roundworms Nematomorpha - Horsehair worms Cycliophora Mollusca - Mollusks Sipuncula - Peanut worms Annelida - Segmented... Typical Classes Subphylum Urochordata - Tunicates Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Orders See text The Actinopterygii are the ray-finned fish. ... Families many, see text The Perciformes, also called the Percomorphi or Acanthopteri, include about 40% of all fish and are the largest order of vertebrates. ... Genera Ammocrypta Crystallaria Etheostoma Gymnocephalus Perca Percarina Percina Romanichthys Sander Zingel The Percidae are a family of perciform fish found in fresh and brackish waters of the Northern Hemisphere. ... Species (see text) Sander (formerly known as Stizostedion) is a genus of fish in the Percidae (Perch) family. ... Trinomial nomenclature is a taxonomic naming system that extends the standard system of binomial nomenclature by adding a third taxon. ... Binomial name Sander vitreus (Mitchill, 1818) Subspecies S. v. ... The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999... A tonne (also called metric ton) is a non-SI unit of mass, accepted for use with SI, defined as: 1 tonne = 103 kg (= 106 g). ... 1880 (MDCCCLXXX) was a leap year starting on Thursday (see link for calendar). ... The 1950s was the decade spanning the years 1950 to 1959. ...

The fish was endemic to lakes Erie and Ontario of the Great Lakes region of North America, including the inter-connecting Niagara River, but most especially to Lake Erie where it sometimes represented more than 50% of the commercial catch. The subspecies was apparently extirpated by about 1965 through a combination of anthropogenic eutrophication, overfishing and competition with the introduced rainbow smelt, Osmerus mordax. The subspecies is now considered extinct. In biology and ecology endemic means exclusively native to a place or biota, in contrast to cosmopolitan or introduced. ... Lake Erie, looking southward from a high rural bluff near Leamington, Ontario Lake Erie (pronounced ) is one of the five large freshwater Great Lakes in North America, which are among the largest in the world. ... Lake Ontario (French: lac Ontario), bounded on the north by Ontario and on the south by Ontarios Niagara Peninsula and by New York State, is one of the five Great Lakes of North America. ... The Great Lakes from space The Great Lakes are a group of five large lakes in North America on or near the Canada-United States border. ... World map showing North America A satellite composite image of North America. ... View from near Horseshoe Falls looking across the Niagara River toward Rainbow Bridge in winter Niagara Glen features many treacherous rapids downstream of Niagara Falls The Niagara River flows to the north from Lake Erie to Lake Ontario. ... 1965 (MCMLXV) was a common year starting on Friday (the link is to a full 1965 calendar). ... Anthropogenic effects or processes are those that are derived from human activities, as opposed to effects or processes that occur in the natural environment without human influences. ... Eutrophication is apparent as increased turbidity in the northern part of the Caspian Sea, imaged from orbit. ... The Traffic Light colour convention, showing the concept of Harvest Control Rule (HCR), specifying when a rebuilding plan is mandatory in terms of precautionary and limit reference points for spawning biomass and fishing mortality rate. ... Competition is the act of striving against another force for the purpose of achieving dominance or attaining a reward or goal, or out of a biological imperative such as survival. ... Binomial name Osmerus mordax (Mitchill, 1814) Subspecies Osmerus mordax mordax Osmerus mordax dentex Rainbow Smelt (Osmerus mordax) is a anadromous species of fish inhabiting rivers and coastal areas of North America from New Jersey to Labrador on the east coast and from Vancouver Island to the Arctic Ocean on the...

There are occasional reports of blue walleye being caught from waters in the Great Lakes basin. This is due to the fact that many yellow walleye populations also contain a colour variant with a bluish colour. The actual blue walleye, however, was said to be distinguishable from the yellow walleye by various meristics and morphometrics which the blue colour variant of the yellow walleye seems not to share. Reportedly, though, some of the meristic and morphometric differences may simply have been artifacts of the different growth rates of yellow and blue walleyes. The clearest evidence, however, is that the blue walleye, whatever its taxonomic status, has been lost. Nonetheless, an investigation of genetic material from preserved blue walleye specimens is currently underway in several research facilities in an effort to decipher the true status of the populations. Meristics is an area of ichthyology which relates to counting quantative features of fish, such as the number of fins or scales. ... Generally, morphometrics (from the Greek: morph, meaning shape or form, and metron”, meaning measurement) comprises methods of extracting measurements from shapes. ... Look up taxonomy in Wiktionary, the free dictionary. ... The general structure of a section of DNA Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the biological development of a cellular form of life or a virus. ...

To date, none of the bluish-coloured walleyes recently captured has been shown to be a blue walleye, despite the fact that at least one organization in the US is offering a reward for the successful capture of a blue walleye specimen. A United States Fish and Wildlife Service recovery plan in the mid-1970s was unable to find any certain evidence of the blue walleye's existence at that time. Nine purported blue walleyes captured in 1975, including a number of gravid females, were inconclusive as to their subspecific designation and failed to produce any viable offspring through artificial propagation. The last known blue walleyes, to any degree of certainty, were captured in about 1965 from both lakes Erie and Ontario. Subsequent exhaustive efforts to find a relict population have been entirely unsuccessful. The loss of the blue walleye is, arguably, an extinction event on par with the loss of the passenger pigeon and the near-extirpation of the American bison. Where once the subspecies numbered in the millions, all are now gone. The USFWS logo The United States Fish and Wildlife Service is a unit of the United States Department of the Interior that is dedicated to managing and preserving wildlife. ... The 1970s decade refers to the years from 1970 to 1979, inclusive. ... 1975 (MCMLXXV) was a common year starting on Wednesday. ... 1965 (MCMLXV) was a common year starting on Friday (the link is to a full 1965 calendar). ... // Binomial name Ectopistes migratorius (Linnaeus, 1766) The Passenger Pigeon (Ectopistes migratorius) was once probably the most common bird in the world. ... Binomial name Bison bison (Linnaeus, 1758) Subspecies B. b. ...

External links

• bagheera.com
• Nativefish.org article about the Blue Pike