Walleye (Sander vitreus, formerly Stizostedion vitreum) is a freshwater perciform fish native to most of Canada and to the northern United States. It is a North American close relative of the European pikeperch. The walleye is sometimes called the yellow walleye to distinguish it from the blue walleye, which is a subspecies that can be found in the southern Ontario and Quebec.
In some parts of its range, the walleye is known as the colored pike, yellow pike or pickerel (esp. in English-speaking Canada), although the fish is not related to other species of pikes which are members of the family Esocidae.
Walleyes show a fair amount of variation across watersheds. In general, fish within a watershed are quite similar and are genetically distinct from those of nearby watersheds. The species has been artificially propagated for over a century and has been planted on top of existing populations or introduced into waters naturally devoid of the species, sometimes reducing the overall genetic distinctiveness of populations.
Meaning of the name 
The common name, "walleye", comes from the fact that the fish's eyes point outward, as if looking at the walls. In medicine, the term "walleyed" (as opposed to "cross-eyed")is used to refer to lateral strabismus, where the pupil deviates outward. This externally facing orientation of the eyes gives anglers an advantage in the dark because there is a certain eyeshine given off by the eye of the walleye in the dark, similar to that of lions and other night dwelling animals. This "eyeshine" is the result of a light-gathering layer in the eyes called the tapetum lucidum, which allows the fish to see well in low-light conditions. In fact, many anglers look for walleyes at night since this is when major feeding patterns occur. The fish's eyes also allow them to see well in turbid waters (stained or rough, breaking waters), which gives them an advantage over their prey. Thus, walleye anglers will commonly look for days and locations where there is a good "walleye chop" (i.e., rough water). This excellent vision also allows the fish to populate the deeper regions in a lake, and they can often be found in deeper water, particularly during the warmest part of the summer.
Physical description 
Walleyes are largely olive and gold in colour (hence the French common name: doré — golden). The dorsal side of a walleye is olive, grading into a golden hue on the flanks. The olive/gold pattern is broken up by five darker saddles that extend to the upper sides. The colour shades to white on the belly. The mouth of a walleye is large and is armed with many sharp teeth. The first dorsal and anal fins are spinous, as is the operculum. Walleyes are distinguished from their close cousin the sauger by the white colouration on the lower lobe of the caudal fin which is absent on the sauger. In addition, the two dorsals and the caudal fin of the sauger are marked with distinctive rows of black dots which are absent from or indistinct on the same fins of walleyes.
Length and weight 
Walleyes grow to about 80 cm (31 in) in length, and weigh up to about 9 kg (20 lb). The maximum recorded size for the fish is 107 cm (42 in) in length and 11.3 kilograms (25 lb) in weight. The growth rate depends partly on where in their range they occur, with southern populations often growing faster and larger. In general, females grow larger than males. Walleyes may live for decades; the maximum recorded age is 29 years. In heavily fished populations, however, few walleye older than five or six years of age are encountered. In North America, where they are heavily prized, their typical size when caught is on the order of 30 to 50 cm (12 to 20 in), substantially below their potential size.
As walleye grow longer, they increase in weight. The relationship between length and weight is not linear. The relationship between total length (L) and total weight (W) for nearly all species of fish can be expressed by an equation of the form
Invariably, b is close to 3.0 for all species, and c is a constant that varies among species. For walleye, b = 3.180 and c = 0.000228 (with units in inches and pounds).
The relationship described in this section suggests a 50 cm (20 in) walleye will weigh about 1.5 kg (3.3 lb), while a 60 cm (24 in) walleye will likely weigh about 2.5 kg (5.5 lb).
In most of the species' range, the majority of male walleyes mature at age three or four. Females normally mature about a year later. Adults migrate to tributary streams in late winter or early spring to lay eggs over gravel and rock, although there are open water reef or shoal spawning strains as well. Some populations are known to spawn on sand or on vegetation. Spawning occurs at water temperatures of 6 to 10 °C (43 to 50 °F). A large female can lay up to 500,000 eggs, and no care is given by the parents to the eggs or fry. The eggs are slightly adhesive and fall into spaces between rocks. The incubation period for the embryos is temperature-dependent, but generally lasts from 12 to 30 days. After hatching, the free-swimming embryo spends about a week absorbing the relatively small amount of yolk. Once the yolk has been fully absorbed, the young walleye begins to feed on invertebrates, such as fly larvæ and zooplankton. After 40 to 60 days, juvenile walleyes become piscivorous. Thenceforth, both juvenile and adult walleyes eat fish almost exclusively, frequently yellow perch or ciscoes, moving onto bars and shoals at night to feed. Walleye also feed heavily on crayfish, minnows, and leeches.
As food 
The walleye is considered to be a quite palatable freshwater fish, and, consequently, is fished recreationally and commercially for food. Because of its nocturnal feeding habits, it is most easily caught at night using live minnows or lures that mimic small fish. Most commercial fisheries for walleye are situated in the Canadian waters of the Great Lakes.
Because walleyes are popular with anglers, fishing for walleyes is regulated by most natural resource agencies. Management may include the use of quotas and length limits to ensure that populations are not over-exploited. As one example, in the state of Michigan, walleye shorter than 15 in (38 cm) may not be legally kept, except in Lake St. Clair and the St. Clair River where fish as short as 13 in (33 cm) may be taken.
Since walleyes have excellent visual acuity under low illumination levels, they tend to feed more extensively at dawn and dusk, on cloudy or overcast days and under choppy conditions when light penetration into the water column is disrupted. Although anglers interpret this as light avoidance, it is merely an expression of the walleye's competitive advantage over its prey under those conditions. Similarly, in darkly stained or turbid waters, walleye tend to feed throughout the day. In the spring and fall walleye are located near the shallower areas due to the spawning grounds; and they are most often located in shallower areas during higher winds due to the murkier, higher oxygenated water at around six feet deep. On calm spring days the walleye are more often located at the deep side of the shoreline drop-off and around shore slopes around or deeper than ten feet.
"Walleye chop" is a term used by walleye anglers for rough water typically with winds of 10 to 25 km/h (6 to 16 mph), and is one of the indicators for good walleye fishing due to the walleye's increased feeding activity during such conditions. In addition to fishing the "Walleye chop", night fishing with live bait can be very effective.
On January 4, 2005, Father Mariusz Zajac from Carrot River, Saskatchewan caught an 18.30 lb (8.30 kg) walleye while ice fishing on Tobin Lake. This walleye stands as the world record for ice fishing and had a girth of 22.5 in (57 cm) and was 36.5 in (93 cm) in length.
Cultural aspects 
The walleye is the state fish of Minnesota and South Dakota and the official fish of Saskatchewan. It is very popular with Minnesota residents; more walleye is eaten in Minnesota than in any other jurisdiction of the United States. Both Garrison and Baudette, Minnesota, claim to be the "Walleye Capital of the World," each with a large statue of the fish.
Winnipeg, Manitoba considers the walleye its most important local fish. Icelandic fishermen in Lake Winnipeg have traditionally supplied the Winnipeg market.
See also 
- In-Fisherman – All About Walleye
- R. O. Anderson and R. M. Neumann, Length, Weight, and Associated Structural Indices, in Fisheries Techniques, second edition, B.E. Murphy and D.W. Willis, eds., American Fisheries Society, 1996.
- "Walleye, Sander vitreus". Department of Natural Resources (DNR), State of Michigan. Retrieved 15 March 2013.
- Joe Fellegy, Jr., Walleyes and Walleye Fishing (Dillon Press, 1974), 57, 58
- Fellegy, 60
- "World Record Walleye", Nipawin.com. Wapiti Valley CAP.
- "Saskatchewan". Canadian Heritage. Retrieved 15 March 2013.
- "Walleyed War of the Walleye Capitals". RoadsideAmerica.com. Doug Kirby, Ken Smith, Mike Wilkins.
Further reading 
- "Sander vitreus". Integrated Taxonomic Information System. Retrieved 19 March 2006.
- "Sander vitreus, Walleye". Fishbase. Retrieved 15 March 2013.
- Cena, Christopher J; George E. Morgan, Michael D. Malette, and Daniel D. Heath (2006). "Inbreeding, Outbreeding and Environmental Effects on Genetic Diversity in 46 Walleye (Sander Vitreus) Populations". Molecular Ecology 15 (2): 303–20.
- Grant, Gerold C; Paul Radomski, and Charles S. Anderson (2004). "Using Underwater Video to Directly Estimate Gear Selectivity: the Retention Probability for Walleye (Sander Vitreus) in Gill Nets". Canadian Journal of Fisheries and Aquatic Sciences 61 (2): 168–74.
- Huppert, Boyd (7 December 2004). "Walleye or Zander? What Are You Really Eating?". Kare 11. Retrieved 15 March 2013.
- Kaufman, Scott D.; John M. Gunn, George E. Morgan, and Patrice Couture (2006). "Muscle Enzymes Reveal Walleye (Sander Vitreus) Are Less Active When Larger Prey (cisco, Coregonus Artedi) Are Present". Canadian Journal of Fisheries and Aquatic Sciences 63 (5): 970–79.
- Simoneau, M (2005). "Fish Growth Rates Modulate Mercury Concentrations in Walleye (Sander Vitreus) from Eastern Canadian Lakes". Environmental Research 98 (1): 73–82.
- Suski, C. D.; S. J. Cooke, S. S. Killen, D. H. Wahl, and B. L. Tufts (2005). "Behaviour of Walleye, Sander Vitreus, and Largemouth Bass, Micropterus Salmoides, Exposed to Different Wave Intensities and Boat Operating Conditions during Livewell Confinement". Fisheries Management and Ecology 12 (1): 119–26.
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