VENICE, Italy – An aquatic invasion is underway in Venice, Italy, where numerous cannibalistic jellyfish, known as comb jellies, are plaguing the city's lagoons. Due to disruptions to the seawater environment and warming temperatures, these invasive species have thrived, threatening fisheries, ecosystems and disrupting swimmers. Unlike jellyfish, these animals do not have stinging tentacles, which can help swimmers feel much calmer as they enter the beautiful lagoons in Venice. Surprisingly, the natural predator of this creature is itself, as comb jellies are cannibalistic, with the pink comb jelly as the usual culprit. "Focus has now moved to controlling the growth and success of the comb jelly in attempts to reverse the fisheries decline in the Black and Azov Seas."