“The major threats to all the lakes include invasive species that throw a delicate ecosystem out of balance. In Erie, more so than the other lakes, toxic algae threaten the health of visitors and create “dead zones” where no aquatic species can survive.

 

At least 136 invasive species — plants, fish and mussels — have forever changed the lakes. But it’s the potential 137th invader that officials fear the most. The Asian carp wants nothing more than to spread through the Great Lakes and continue its feeding frenzy. Though a live fish has yet to be found, DNA tests suggest that they might already have infiltrated Lake Erie.”