No. Unlike an anchor line, which you pull up through swimming jellyfish (and which sometimes comes up covered with tentacles), jellyfish are below and outside the Nettle Net Boat Pool when the pool is in the water. Jellyfish are not in the space that you are pulling the pool through. If jellyfish do come in contact with the fine mesh they slide off, leaving a negligible amount if any stingers. We have never heard of anyone getting stung while retrieving a pool.