The decline happened in the mid-1900s due to overfishing and non-native, predatory sea lampreys
With a decline to "extremely low levels" in the mid-1900s, the level of lake trout in Lake Superior has been fully recovered in most of the lake.
In the mid-1900’s, lake trout populations declined to extremely low levels in Lake Superior due to extensive overfishing and the devastation wrought by non-native, predatory sea lampreys.
Lake trout supported an annual commercial harvest of 4 million pounds between 1920 and 1950. By 1964, however, only 210,000 pounds were harvested. Today’s announcement of a fully restored lake trout population in Lake Superior comes after nearly 70 years of concerted rehabilitation efforts. The LSC estimates the current abundance of naturally reproduced lake trout is at or above the best estimates of abundance prior to the sea lamprey invasion in 1938.
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