How big of a dilemma are jellyfish in the Great Barrier Reef?

Question by Kyle S: How big of a dilemma are jellyfish in the Great Barrier Reef?
Hi, I planning on getting my Sea-Card soon or train to become a diver, and I was thinking about diving in the Great Barrier not for the first dive though. If I recall call jellyfish can be deadly? Is that the largest threat?

Best answer:

Answer by MR_SOUFF
according to a national geographic special about the jelly fish, and other poison species from Australia, the jelly fish are very poisonous, they can cause swelling unconsciousness and even death.

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