Thesea lamprey sucks the blood out of certain fish like the lake trout. This reduces the population of many important affected native fish.
There has been a massive invasion of the Great Lakes since the Welland Canal opened in 1929. The populations of lake trout and other important game and commercial fish has been drastically reduced. This affects a multi-billion dollar industry. Efforts to reduce sea lamprey populations have been successful, allowing for successful efforts to restore lake trout. However, sea lamprey populations are increasing again.
• Male sea lampreys need to be trapped and sterilized• And you could use lampricides to kill lamprey larvae,