Gene Kim Jellyfish thrive in the hotter ocean temperatures caused by global warming. A Danish team of researchers figured out a way to convert the jellyfish's soft rubbery tentacles to crunchy snacks earlier this year. A plateful of jellyfish is beneficial to health — they're low in calories, barely contain any fat and are packed with nutrients like vitamin B12, magnesium, phosphorus, iron and selenium. Jellyfish are already an established Asian delicacy.