Rebha Raviraj was recently on a boat off the coast of Groton, 海角换妻, helping to retrieve abandoned lobster traps, when she saw a 鈥渉uge, bright yellow鈥� sea slug attached to a cage.
The conspicuous critter dwarfed slugs native to Long Island Sound, which can be smaller than the tip of your finger. This slug was 1.5 inches long.
鈥淚 immediately knew that was worth collecting to bring back onto land for a closer look,鈥� Raviraj said.
Raviraj, a 23-year-old conservation research assistant at , eventually identified the sea slug as , a large and invasive sea slug normally seen in European waters.
It鈥檚 the first time the European slug has been found in Long Island Sound.
The sighting off the 海角换妻 coast was a first. But the sea slug (scientists call it a 鈥渘udibranch鈥�), has been making headway in New England waters.
Since 2017, it鈥檚 been found off the coast of Cape Ann, Massachusetts.
Scientists at the Maritime Aquarium are now studying the invasive slug, which feeds on sponges, to gauge any potential future impacts on Long Island Sound鈥檚 ecosystem.
鈥淲e鈥檙e gathering up different sponge species that are native to Long Island Sound, to see which sponges it's more attracted to, which ones it is eating more,鈥� Raviraj said.
If native sponges are a favorite food of the invasive sea slug, Raviraj said, that could harm the Sound鈥檚 water quality.
鈥淪ponges are filter feeders,鈥� she said. 鈥淎nd they do a great job of filtering our water.鈥�
Sponges can also provide shelter and habitat for other sea creatures.
Why and how the slug migrated to the Sound remains unclear. But Raviraj said sea slugs are sensitive to changes in water temperature and climate change is suspected.
