Blue walleye

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Blue Walleye (Blue Pike)
Blue walleye.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae
Genus: Sander
Species: S. vitreus
Subspecies: S. v. glaucus (invalid)
Trinomial name
Sander vitreus glaucus (invalid)
(Hubbs, 1926)
Synonyms
  • Stizostedion glaucum
    Hubbs, 1926
  • Stizostedion vitreum glaucum
    Trautman, 1981

The blue walleye (Sander vitreus glaucus), also called the blue pike, is an invalid subspecies of walleye which was endemic to the Great Lakes of North America. Morphometric studies led biologists to classify the blue walleye as a separate species in 1926, although it was later downgraded to a subspecies. Listed as an endangered species by the United States in 1967, it was declared extinct in 1983.

Genetic analyses conducted in the 21st century show that the blue walleye was not genetically different from the yellow walleye (Sander vitreus), rendering the taxon blue walleye invalid.

Species controversy[edit]

Blue color variant of the yellow walleye

The blue walleye was long considered to be different from the yellow walleye.[1] Based on morphological study, Carl Leavitt Hubbs declared the blue walleye to be a separate species in 1926.[2] The species was later downgraded to a subspecies.[3]

The blue walleye was a commercially valuable fish in the Great Lakes. Populations appeared to collapse quickly in the 1950s. Between 1950 and 1957, catches in the U.S. and Canada fluctuated between 2,000,000 pounds (910,000 kg) and 26,000,000 pounds (12,000,000 kg) a year. In 1959, however, just 79,000 pounds (36,000 kg) were caught, and in 1964 only 200 pounds (91 kg).[4] The United States declared blue walleye an endangered species in 1967,[5] and extinct in 1983.[6]

A 2014 genetic study of 1,181 preserved "historic" walleye (70 to 90 years old), blue walleye/blue pike, and modern walleye found no evidence for concluding that blue walleye/blue pike was a subspecies of walleye.[7] This rendered the taxon invalid.[8]

Occasionally, grey-blue or steel-blue walleye have caught in Lake Erie, Lake Ontario, and the Ohio River drainage.[9] Dark blue yellow perch are also sometimes caught in the same areas.[10]

A turquoise-colored walleye exists in some waters of the Canadian Shield.[11] A mucosal pigment, named "sandercyanin", was hypothesized to be the source of the color,[12] but this has not been confirmed.[13] This fish was also thought to be a separate subspecies of walleye, but genetic testing showed there is no difference between the turquoise walleye and yellow walleye.[8]

References[edit]

  1. ^ Bolsenga, S.J.; Herdendorf, Charles E., eds. (1993). Lake Erie and Lake St. Clair Handbook. Detroit: Wayne State University Press. p. 323. ISBN 9780814324707. 
  2. ^ Wallus, Robert; Scott, Edwin M. (2004). "Genus: Sander (Rafinesque)". In Simon, Thomas P.; Wallus, Robert. Reproductive Biology and Early Life History of Fishes in the Ohio River Drainage. Vol. 4: Percidae - Perch, Pikeperch and Darters. Boca Raton, Fla.: CRC Press. p. 570. ISBN 084931920X. 
  3. ^ Bennett, David Henry (1979). Probable Walleye (Stizostedion Vitreum) Habitation in the Snake River and Tributaries of Idaho: Research Technical Completion Report (Report). Boise, Idaho: Idaho Water Resources Research Institute, University of Idaho. p. 4. OCLC 5525598. 
  4. ^ Trautman, Milton B. (1981). The Fishes of Ohio. Columbus, Ohio: Ohio State University Press. p. 613. ISBN 9780814202135. 
  5. ^ Wilcove, David Samuel (2000). The Condor's Shadow: The Loss and Recovery of Wildlife in America. New York: Anchor Books. p. 129. ISBN 9780385498814. 
  6. ^ Weidensaul, Scott (2002). The Ghost With Trembling Wings: Science, Wishful Thinking, and the Search for Lost Species. New York: North Point Press. p. 72. ISBN 9780374246648. 
  7. ^ Haponski, Amanda E.; Stepien, Carol A. (2014). "A population genetic window into the past and future of the walleye Sander vitreus: relation to historic walleye and the extinct 'blue pike' S. v. 'glaucus'". BMC Evolutionary Biology. 14 (133). doi:10.1186/1471-2148-14-133. PMC 4229939Freely accessible. 
  8. ^ a b Stepien, Carol A.; Haponski, Amanda E. (2015). "Taxonomy, Distribution, and Evolution of the Percidae". In Kestemont, P.; Dabrowski, Konrad; Summerfelt, Robert C. Biology and Culture of Percid Fishes: Principles and Practices. New York: Springer. p. 21. ISBN 9789401772266. 
  9. ^ Trautman, Milton B. (1981). The Fishes of Ohio. Columbus, Ohio: Ohio State University Press. pp. 611, 613. ISBN 9780814202135 ; Scott, William B.; Crossman, Edwin J. (1973). Freshwater Fishes of Canada. Bulletin 184 (PDF). Ottawa: Fisheries Research Board of Canada. p. 768. OCLC 256035728. Retrieved April 27, 2018. 
  10. ^ Trautman, Milton B. (1981). The Fishes of Ohio. Columbus, Ohio: Ohio State University Press. p. 612. ISBN 9780814202135 ; Scott, William B.; Crossman, Edwin J. (1973). Freshwater Fishes of Canada. Bulletin 184 (PDF). Ottawa: Fisheries Research Board of Canada. pp. 755–756. OCLC 256035728. Retrieved April 27, 2018. 
  11. ^ Paradis, Yves; Magnan, Pierre (2005). "Phenotypic variation of walleye, Sander vitreus, in Canadian Shield lakes: New insights on percid polymorphism". Environmental Biology of Fishes. 73 (4): 357–366. doi:10.1007/s10641-005-2261-1. Retrieved April 27, 2018. 
  12. ^ Yu, Chi-Li; Ferraro, Daniel; Ramaswamy, S.; Schmitz, Mark H.; Schaefer, Wayne F.; Gibson, David T. (2008). "Purification and properties of sandercyanin, a blue protein secreted in the mucus of blue forms of walleye, Sander vitreus". Environmental Biology of Fishes. 82 (1): 51–58. doi:10.1007/s10641-007-9252-3. 
  13. ^ Schaefer, Wayne F.; Schmitz, Mark H.; Blazer, Vicki S.; Ehlinger, Timothy J.; Bergese, John A. (2015). "Localization and seasonal variation of blue pigment (sandercyanin) in walleye (Sander vitreus)". Canadian Journal of Fisheries and Aquatic Sciences. 72 (2): 281–289. doi:10.1007/s10641-005-2261-1. Retrieved April 27, 2018. 

Further reading[edit]

  • Hubbs, Carl L. (1926). A Check-List of the Fishes of the Great Lakes and Tributary Waters, with Nomenclatorial Notes and Analytical Keys. University of Michigan Museum of Zoology Special Publications No. 15. Ann Arbor: University of Michigan. 77 pp. + Plates I-IV. (Stizostedion glaucum, new species, pp. 58-59 + Plate IV, figure 2).
  • Trautman, Milton B. (1981). The Fishes of Ohio. Columbus, Ohio: Ohio State University Press. 782 pp. ISBN 978-0814202135. (Stizostedion vitreum glaucum, new combination).