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Loon Magic - Wayzata Technology (8011) (1993).iso
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13 Hanging On - Comm.Fishing
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1993-07-20
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Commercial Fishing
Nets set for trout or other game fish often catch more than fish.
Deep-diving loons entangle themselves in nets with all too frequent
regularity. In 1960 and 1961, a combined total of about 5,000
common loons died in nets on Great Slave Lake in the Northwest
Territories. While losses on the Great Lakes do not reach that level,
John Lerg of the Michigan Department of Natural Resources reported
at a 1981 loon conference in Minneapolis that a "substantial" number
of loons are killed in Michigan waters of Lakes Superior and
Michigan through commercial fishing operations. Others in the
Michigan DNR have termed the mortality "very high," but do not
provide numerical estimates. Commercial fishermen working the
waters off the Garden Peninsula in Lake Michigan are responsible for
most of the Great Lakes common loon mortality.
Hydro Power Water Levels
Loons require relatively stable water levels for successful nesting.
Fluctuating water levels caused by hydro-electric dams can be
detrimental to loon populations. The problem is particularly acute in
the Northeast where hydro developments control the levels of many
important loon lakes. New Hampshire's Lake Umbagog is a case in
point. According to a long-time lake resident Armand Riendeau, Lake
Umbagog's wildlife, especially ducks and loons, has suffered in some
years from the policies of the company owning the water rights on
the river systems feeding the sprawling wilderness lake. Riendeau
claims up to ninety percent of the nesting ducks have been lost in
some years to nest flooding. Despite the presence of eleven common
loon nests on Umbagog in 1978, chick production was zero. This
prompted the New Hampshire Loon Preservation Committee to
contact the power company and negotiate an informal agreement to
maintain water levels during the loon nesting season at a fairly
constant level. It worked. Umbagog is now in the top three New
Hampshire loon lakes for chick production.
Maine, too, has experienced problems with water fluctuations on
some of its reservoirs, but according to Jane Arbuckle of the Maine
Audubon Society, Maine utility officials have been cooperative by
attempting to hold levels stable during the spring nesting season.