| 翻訳と辞書 |
| Deepwater sculpin ： ウィキペディア英語版 |
Deepwater sculpin
The deepwater sculpin (''Myoxocephalus thompsonii'') is a freshwater sculpin that inhabits the bottoms of cold, deep freshwater lakes of northern North America. Its distribution ranges from the Great Bear Lake of Canada to the Great Lakes. It is a designated at-risk fish species in Canada, protected as a species of Special Concern under Canada's ''Species at Risk Act''.〔(The Deepwater Sculpin (Great Lakes-Western St. Lawrence)... a Species at Risk ) Department of Fisheries and Oceans fact sheet (accessed 12 Feb 2011).〕〔(Assessment and Update Status Report on the Deepwater Sculpin ''Myoxocephalus thompsonii'' in Canada ) COSEWIC Status Report 2006.〕
The deepwater sculpin is generally gray-brown with mottling on its head, back, and sides with a whitish underside. When full-grown, they are usually between 4 and 6 inches (10–15 cm), but they can reach to 9 inches (23 cm). They weigh less than an ounce (<25 g). They are a bottom-feeding species, which makes them vulnerable to a build-up in contaminants in polluted lakes. They were considered extinct in Lake Erie and Lake Ontario, but have recently been rediscovered there. They mostly eat tiny crustaceans and aquatic insects and are eaten by lake trout and other predatory fish.〔
==Distribution==
The distribution of the Deepwater Sculpin is almost entirely limited to Canada with the exception of the American Great Lakes and a few inland lakes in Michigan, Minnesota and Montana.〔 A September 2007 study by the Waterton Lakes National Park and the University of Lethbridge found that the Deepwater Sculpin is the third most common fish in Upper Waterton Lake in extreme northwestern Montana and Canada.
"In Canada, its distribution is patchy and limited to cold, deep lakes in areas that were formerly glaciated or with proglacial lake connections. This includes the Gatineau region through the Laurentian Great Lakes, Manitoba and Saskatchewan and northward to Great Bear and Great Slave lakes in the Northwest Territories. An isolated population also exists in Waterton Lake, Alberta. Designated at risk (Special Concern) are the Great Lakes-Western St. Lawrence populations, which are found in only 10 lakes in eastern Canada. In Ontario, this fish occurs in lakes Nipigon, Ontario, Superior, Fairbank, Huron and Erie. In Lake Erie, only larvae (young-of-the-year) have been observed. In Quebec, it occurs in Lac des Îles and in Roddick, Thirty-one-Mile and Heney lakes. Populations in Heney Lake and Lac des Îles are in decline or may even no longer exist."〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Deepwater sculpin」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|