Do Dangerous Fish Live in the Great Lakes?
Yes. There are a variety of dangerous fish that live in the Great Lakes. None of them are native to the lakes but have been introduced either accidentally or on purpose. People who have aquariums with exotic fish will sometimes release their fish if the fish get too big or the owners can no longer can care for them. This is a huge mistake and takes a toll on the natural ecosystem. Invasive fish can kill and eat all kinds of other species and vegetation, wreaking havoc on the balance of the lakes habitat. Three of the most dangerous fish in the Great Lakes are the pacu, snakehead and sea lamprey. Wait until you see photos of these fish!
What is a Pacu?
Have Pacus Been Found in the Great Lakes?
In 2016 the Michigan DNR had three reports of the strange looking Pacu showing up in the Great Lakes. They reported that every other year they have a report of finding one of these. So there are not schools of these fish in the Great Lakes and it is not a problem yet, but it only takes a few apex predator species to take over a new ecosystem. On January 12, 2021 a Pacu washed up on shore in Pennsylvania, having been found in Glade Run Lake in Butler County. This one was about 12 inches long and dead, but who knows how long it had been living in the lake. Pacu are a warm-water fish and are not equipped to deal with cooler temperatures so it is unlikely they would survive the winter in any of the Great Lakes.
What is a Snakehead?
Judging by the name these are not a popular fish. They do actually have a head that looks like a snake. They are not native to the Great Lakes and are causing problems because they have a ferocious appetite and compete for food with the popular sport fish bass and walleye. Snakeheads are a long narrow fish with snake-like head and mouth full of teeth. Their coloration has a molted snake-like look as well. Adults can get to be 3 feet long. Because they feed in schools you can imagine the damage they can do in a short period of time. Snakeheads are sometimes called “Frakenfish” because they can survive on land for 3-7 days! They have to remain wet but can use their air bladder to process air and survive. Amazing! Currently there is not a breeding population of snakeheads in any of the Great Lakes.
What is a Sea Lamprey?
If you thought those first two fish were “unique” looking you are going to be surprised by the sea lamprey. Can you imagine enjoying a sunny June day on Lake Michigan floating on a floaty to look down and see one of these! Sea Lampreys are established in the Great Lakes and they are a huge problem. The Sea Lamprey is a parasitic fish that uses its large tooth-filled suction cup mouth to latch on to other fish. They feed off other fish which frequently leads to the death of the fish.
Why are Sea Lampreys a Dangerous Fish of the Great Lakes?
Sea lampreys have been a huge problem for decades that started back in the late 1940’s. With the addition of a new canal by Niagara Falls, the sea lamprey were able to enter the Great Lakes. With very few predators and an enormously fast reproductive rate they took over. For example, before the sea lampreys invaded there were around 15 million pounds of lake trout per year, by the early 1960’s that had dropped to 300,000. Think about all the people that depended on the trout business that were now out of work. Conservationists continue to try to control and reduce their populations.
Are Sea Lampreys dangerous to people?
Sea Lampreys are not dangerous to people. They do not really latch onto people or bite people and if they did you could easily remove them. It takes a while for them to suction themselves onto a host and people wouldn’t let a sea lamprey do that. Sea lampreys are about 1-2 feet long and have a large circular mouth.
