Question: Why do your baby jelly fish cling to hard surfaces, What would it be beneficial to the baby jellyfish if we stopped putting hard surfaces in the water.

Lion's Mane Jellyfish answered on 21 Nov 2017:

Jellyfish have multiple life stages, and one of these life stages (polyp) needs something stable on which it can attach and grow. From this stable surface, it can grow, feed and reproduce asexually to create more versions of itself that will float off and become big jellyfish like the ones you can see in the ocean!

Baby jellyfish (larvae) will stick to pretty much any hard surface they encounter, whether it’s a rock, a piece of floating wood or even the bottom of a boat. Whilst humans are adding more and more hard surfaces into the water with plastic pollution, there are plenty of natural surfaces for the jellyfish to find – so I imagine that the Lion’s Mane jellyfish populations will still increase even if we stopped adding manmade surfaces into the water!