where is the above mentioned islands are located?
They are a chain of 14 large volcanic islands and 55 smaller islands, most of which belong to the U.S. state of Alaska, but some belong to the Russian federal subject of Kamchatka Krai.
Aleutian Islands
Most of the Aleutian Islands belong to the U.S. state of Alaska, but some belong to the Russian federal subject of Kamchatka Krai. 
when does a rainbow trout become a steelhead UNANSWERABLE what does this trout look like? Adult freshwater forms are generally blue-green or olive green with heavy black spotting over the length of the body. Adult fish have a broad reddish stripe along the lateral line, from gills to the tail, which is most pronounced in breeding males. what is their lifespan? 11 years is there any disease associated with this fish species? Yes, Enteric redmouth disease. where is this trout fish commonly found? he native range of is in the coastal waters and tributary streams of the Pacific basin, from the Kamchatka Peninsula in Russia, east along the Aleutian Islands, throughout southwest Alaska, the Pacific coast of British Columbia and southeast Alaska, and south along the west coast of the U.S. to northern Mexico. how is the above mentioned disease is caused in this particular fish? It is a bacterial infection of freshwater and marine fish caused by the pathogen.
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Aleutian Islands [SEP] Introduction
The Aleutian Islands (; ; , literally "Land of the Aleuts", possibly from Chukchi "aliat", "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a chain of 14 large volcanic islands and 55 smaller islands. Most of the Aleutian Islands belong to the U.S. state of Alaska, but some belong to the Russian federal subject of Kamchatka Krai. They form part of the Aleutian Arc in the Northern Pacific Ocean, occupying an area of 6,821 sq mi (17,666 km) and extending about westward from the Alaska Peninsula toward the Kamchatka Peninsula in Russia, and mark a dividing line between the Bering Sea to the north and the Pacific Ocean to the south.