Swarms of stinging jellyfish have invaded the waters off Goa leaving over 90 bathers requiring first aid in the last two days, lifeguarding agency Drishti Marine said. The Baga-Calangute beach belt witnessed over 55 cases while the Candolim to Sinquerim beach stretch saw 10 cases. South Goa reported over 25 cases of jellyfish related accidents requiring immediate first aid.