0
The Sea Lamprey got into the Great Lakes via the St. Lawrence Seaway in the early fifties.
Until then, Lakes Michigan and Superior were famous for their Lake Trout fisheries. The lamprey totally devastated that, and while strides have been made by the Michigan Department or Natural Resources and Environment in controlling the lamprey, the fishery has never completely recovered.
The Zebra Mussel I am well familiar with, but I am not completely clear on it's long-term effect on the fishery - future edits to this question may help.
What else can I help you with?
What are major threats to the grizzly bear population?
Drunks with guns Hillbillies
Is the protection of the US sovereignty territory domestic population and critical infrastructure against external threats and aggression or other threats.?
homeland defense
What are two threats to the okapi population?
Poaching for meat, and deforestation for agriculture reduces their habitat
Why does population inccrease?
because people have few threats other than war and climate change
What is the population of an Ocelot?
The population of ocelots varies by region, but overall they are considered near threatened with an estimated population of around 50,000 individuals. Loss of habitat, hunting, and fragmentation of their range are major threats to their population.
Are there any threats to the population of foxes?
The only one i can think of is cutting down trees. A.K.A deforesting
What are human threats to the Asiatic lion?
One of the main threats to the Asiatic Lion comes from the increasing hostility on the part of the resident human population of Gir. This website has more info on the subject: iloveindia.com
are human threats to the Asiatic lion?
One of the main threats to the Asiatic Lion comes from the increasing hostility on the part of the resident human population of Gir. This website has more info on the subject: iloveindia.com
What are major threats to the forest?
The major threats to any habitat or species can be summarized with the acronym HIPPO. Habitat destruction Invasive species Pollution Population growth (of humans) Overexploitation Each one of these threats reduces biodiversity, and destroys habitats, such as forests all around the world.
What are the major threats and causes that affect the giant panda?
Deforestation,poaching,population expansion,humans and destroying there habitats.
What are the threats to sinharaja rainforest in SriLanka?
it is being cut down by man for land because of the increase in the population of people around it.
Components of Health System?
A well functioning health system responds in a balanced way to a population's needs and expectations. They improve the health status of individuals, and defend the population against health threats.
