barrel jellyfish (rhizostoma pulmo) among blue waters with an unrecognizable person in background

jellyfish barrel rhizostoma pulmo marine life underwater woman swim snorkel beach sea beams snorkeling sun beam aquatic blue poison nature wildlife biology swimming mediterranean diving person poisonous sardinia tentacles white sunlight ecosystem environment creature dive organism conservation water scuba habitat world oceanic species clear natural animal undersea purple waters unrecognizable background trough concept