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首页> 美国政府科技报告 >Population Dynamics and Harvest of Maintained Walleye Populations in Two Lakes ofthe Southern Minnesota Agricultural Region
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Population Dynamics and Harvest of Maintained Walleye Populations in Two Lakes ofthe Southern Minnesota Agricultural Region

机译：明尼苏达州南部农业区两湖区人口动态与养殖大眼人口的收获

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Walleye Stizostedion vitreum fisheries in two ecologically different lakesdeclined steadily from 1988 to 1990, reflecting passage of a strong 1986 year class and low contributions from heavy 1988 fingerling stockings. Total annual mortality rate estimates for Madison Lake walleye age 4 and older were 48 and 46 percent for 1988-89 and 1989-90, respectively. For the same periods, Elysian Lake estimates were 39 and 75 percent, espectively. With high mortality and near zero recruitment, the Elysian Lake fishery collapsed in 1990. Annual exploitation estimates of age-4 and older walleye ranged from 25-37 percent for Madison Lake and from 16-50 percent for Elysian Lake. In terms of yields from Madison Lake averaged 8.4 kg/hectare over three fishing seasons (range 3.3 to 14.1 kg/hectare). Before the population collapse, Elysian Lake yields were 4.7 and 4.0 kg/hectare. Mean weights of harvested walleye were 0.88 kg (0.71-1.04 kg) from Madison Lake and 0.73 kg (0.69-0.82 kg) from Elysian Lake.

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