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Walleye ( Stizostedion vitreum)

Walleye ( Stizostedion vitreum). Angela Auel. Identification: brassy olive above, white below; caudal fin has white tip on lower lobe; large, white glossy eyes and sharp teeth (Iowa DNR) Distribution: statewide in large lakes and rivers (Iowa DNR)

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Walleye ( Stizostedion vitreum)

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  1. Walleye (Stizostedion vitreum) Angela Auel Identification:brassy olive above, white below; caudal fin has white tip on lower lobe;large, white glossy eyes and sharp teeth(Iowa DNR) Distribution: statewide in large lakes and rivers (Iowa DNR) Habitat: interior rivers and streams; natural & constructed lakes (Iowa DNR) Iowa DNR

  2. Walleye (Stizostedion vitreum) Diet: mostly fish; other aquatic animals (Iowa DNR) Reproduction: Spawns in April; no nest preparation or parental care; females lay between 23, 000 and 50,000 eggs, hatch in about seven days; enhanced populations with hatchery-reared fish (Iowa DNR) Conservation status: common and native (Iowa DNR) Minnesota DNR

  3. Walleye (Stizostedion vitreum) Economic/recreational value: “Its size, sporting qualities and delicious flesh make it one of the most important game species in North America,” Iowa DNR. Ecological importance: Important predator fish Other Common Names: blue pike; dory; glass-eye; gray, green pike; jack, jackfish, jack salmon, marble-eye, pike, pike-perch, sauger, Susquchanna salmon, walleyed perch, walleyed pike, white eye,

  4. References: Stizostedion vitreum Iowa Department of Natural Resources. 1994. IowaDNR Fish and Fishing. Available at http://www.iowadnr.com/fish/iafish/wae-card.html. November 2004. Iowa Department of Natural Resources. 1994. IowaDNR Fish and Fishing. Available at http://www.iowadnr.com/education/files/walleye.pdf. November 2004. Iowa Department of Natural Resources. 1994. IowaDNR Fish and Fishing. Available at http://www.iowadnr.com/fish/iafish/walleye.html. November 2004.

  5. Rainbow DarterEtheostoma boschungi Lindsey Ewinger http://www.dnr.state.oh.us/wildlife/Fishing/aquanotes-fishid/rainbowdart.htm

  6. Female • Identification: • 13 rays on pectoral fins • Thickest under the first dorsal fin • No scales on cheeks • Bars on sides • Males have blue between red • Females have brown between yellow or white http://www.dnr.state.oh.us/wildlife/Fishing/aquanotes-fishid/rainbowdart.htm Male in spawning colors Conservation Status: No Special Status Moderately Abundant http://dnr.state.il.us/lands/education/kids/KIDSCONS/Fall1999/ILfish.htm

  7. Distribution: • Northeast Iowa • Mississippi River Basin http://www.pca.state.mn.us/kids/fish/rainbowdarter.html Habitat: Clean, clear, fast-flowing rivers and large streams Gravel, rubble, and rock substrates, occasionally bedrock http://www.iowadnr.com/fish/iafish/raindart.html

  8. Mayfly larvae http://www.wwtlearn.org.uk/index0.html?factfile/pond-safari.htm&2 Stonefly larvae • Diet: • Caddisfly, stonefly, and mayfly larvae, water mites, water fleas, fish eggs, small crayfish and snails http://www.kidfish.bc.ca/tying/stonefly/pics/stonefly_larvae.htm Crayfish http://www.rosecanyon.org/live/photo-html/crayfish.html Interesting Fact:Have only a rudimentary swim bladder

  9. Reproduction: • Season: late March to May • Male defends a territory in a gravel riffle • Females enter the riffle only to spawn • Female buries half her body in the gravel • Male joins her and eggs are left buried in the gravel until they hatch • Females spawn several times in a season, 500 to 1,500 eggs per season • No parental care Ecologic/Economic Importance: Food for many piscivorous fish and bird species including: blue heron and smallmouth bass Too small to be commercially or recreationally important to fishing Popular aquarium fish among native keeping aquarists

  10. References • Etnier, D.A. and W.C. Starnes. 1993. The Fishes of Tennessee. The University of Tennessee Press, Knoxville. • Greenhalgh, M. 1999. Freshwater Fish, The Natural History of Over 160 Native European Species. Octopus Publishing Group Ltd, London. • Iowa Department of Natural Resources. 1994. IowaDNR Fish and Fishing. Available at http://www.iowadnr.com/fish/iafish/iafish.htm. • Ohio Department of Natural Resources. 2004. Ohio Department of Natural Resources, Wildlife Division, Life History Notes: Brook Stickleback. Available at http://www.dnr.state.oh.us/wildlife/Fishing/aquanotes-fishid/bstickle.htm. • Zim, H.S. and H.H. Shoemaker. 1956. Fishes, A Guide to Familiar American Species. Simon and Schuster, New York.

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