Suez Canal expansion gets heat as main reason behind jellyfish invasion: The latest expansion of the Suez Canal is getting a lot of heat, as experts say that it might be the “primary cause” of the jellyfish invasion that arrived to the shores of the North Coast’s beaches this summer, the Associated Press says. “Other ecosystem stressors have allowed them to thrive and become a plague,” Plymouth University marine biologist Jason Hall-Spencer tells the newswire, but the larger waterway is what let them through in the first place.