Scientists say climate change, caused mainly by burning oil, coal and gas, is making the Mediterranean Sea hotter, bringing hundreds of new and invasive fish species that decimate indigenous populations. The warming waters have made an inviting new home for invasive species like the spotted puffer fish, a voracious predator and the "worst invader," Azzuro said. Cyprus, due to its proximity to the Suez Canal, was first to feel the impact of these invasive fish. About 1,000 invasive species have been identifiedAzzuro said about 1,000 invasive species have been identified in the Mediterranean, with 800 of them firmly established. One way is to commercialize invasive species that are edible.