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Jellies have been around for millions of years and over that time many predators have relied on them as a staple food source. Most filter feeders will eat the early stages of a jellyfish, the egg and planula larva which are free floating. Depending on water conditions, the egg and larva swarms create large nutritional seasonal abundance.
A variety of lifeforms in the wild eat jellyfishes. Fishes like sunfish, whale shark, chum salmon and tuna fish eat jellyfishes.
Reptiles like the leatherback, loggerhead, Green and hawkbill turtles eat jellyfishes.
Mammals like red tailed foxes and penguins consume jellyfishes that become washed up ashore and even members of the jellyfish group such as other jellyfishes, anemones and small molluscs eat jellyfishes.
Scientists have discovered a jellyfish which can live forever. The Immortal Jellyfish known scientifically as Turritopsis dohrnii is now officially known as the only immortal creature. The secret to eternal life, as it turns out, is not just living a really, really long time. It’s all about maturity, or rather, the lack of it.
Three species have been affected greatly by plastic pollution as they often mistake plastic bags for jellyfish. On attempting to ingest the bag they can suffocate on it, and this often happens with the greens and the loggerheads whilst they are sub-adults, taking them out of the food web early. Consequently, the predation pressures commonly exerted on jellyfish are removed allowing the plague populations to grow.
Countless fish rely on immature and mature medusa jellyfish for a source of nutrition.
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