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DeRuyter Reservoir Fall Walleye Survey 2013

Survey Number: 713017

Survey Date: September 29, 2013

Fall night electrofishing was conducted along 2.9 miles of the DeRuyter Reservoir shoreline to evaluate the relative success of the 2013 stocking of 50,000 walleye fingerlings. The Reservoir has been historically stocked by the Department with 1.1-2.8 million walleye fry. 2013 was the first year of an experimental walleye fingerling stocking program undertaken by the DeRuyter Reservoir Association (DRA). Walleye are being purchased and stocked by the DRA as a "top-down" aquatic vegetation control method. In theory, walleye will prey on bluegill and pumpkinseed sunfish, which are known to prey on insect herbivores that graze on the invasive Eurasian watermilfoil. With fewer predators, it is theorized, that these grazers will become more numerous, and thus there will be less Eurasain watermilfoil in the lake.

No Young-of-Year (YOY) walleye were found, but 26 older walleye were collected. These walleye ranged from 3 to 11 years old and from 14.2 - 27 inches. Walleye collected were on the thin side with a mean relative weight (Wr) of 82.5±6.1. A normal Wr range is 90-100. As no YOY were collected it would appear that there was limited success with the 2013 walleye stocking.

In addition to the walleye, 15 largemouth bass (2.6-14.7 inches), 5 smallmouth bass (7.1-15.4 inches), and four chain pickerel (16-19.1 inches) were also collected during one of the three electrofishing sampling runs.

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