Parasites in the Shallows – Sea Lamprey Monitoring


(ominous music) – We’re at the Humber
River at the first dam, right before Lake Ontario. We’re at the sea lamprey traps. Sea lamprey are an invasive species. They have a large circular
mouth with rows of teeth. They also have teeth on their tongue, so what they do is they attach to the side of salmon and species, and essentially scrape away their flesh, and
feed on their internal fluids, killing the fish ultimately. They’re native to the Atlantic Ocean, in the 1800s, early 1800s,
they started to appear in Lake Ontario and the Great Lakes. They entered through
the shipping channels. In the mid-1900s, so 1940s, 1950s, we began to see a steady decline in our lake trout and
whitefishes populations. Since 2005 we’ve been
working in partnership with the Department of
Fisheries and Oceans. We have three traps in total, there’s two here at the Humber Dam, and there’s one at the Duffins Dam. We check these traps on a daily basis during the spawning
season, for sea lamprey, which is mid-April to
mid-June, approximately. Every year they swim upstream to spawn. They get trapped at the dam here, and they get funneled to the side, and we catch them in our cages. All of the sea lamprey that
we capture in our traps are removed, as of now,
populations of sea lamprey have reached a plateau, so we will never fully eradicate them, but
with constant management, we should be able to keep
them below a certain level, and see those fisheries rise.

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34 thoughts on “Parasites in the Shallows – Sea Lamprey Monitoring

  1. Very exciting ! As far i can see in the available litterature, there is much that we don't know about lampreys in general.

  2. Losiento no tengo ni idea de lo que dicen pero en españa se llama lamprea i llegan a algunos ríos español i selas comen

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