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Theoretically there is no limit to the size that a Echizen can grow.
The largest Echizen that I'm aware of, measured about 17 feet across. They are squat jellyfish, so their length is about the same size as their breath. But they still can look HUMUNGOUS next to a diver.
There are three factors that effect Echizen Jellyfish size:
1) Weightlessness. Creatures that live on land have gravity-based limits to their size. If they get too large they will crush their own organs and / or break their own bones and structural support. Creatures that live all the time in the water have no such limitations because their bodies are supported by the water they live in. This then gives most sea-creatures size limits based on how long they live, and how much they can eat.
2) Water Temperature: The Echizen Jelly cannot survive in cold water, so they have historically died when winter comes if they are as far north as Japan. So most cannot live even 1 year, creating a size limit based solely on the amount it can eat in about a year.
3) Abundance of Food:
a) The Echizen Jellyfish have no sence of being "full", as we do, and so will eat all of it's foodsource (zoe-plankton) that is available. Overfishing has depleated it's main rival for the plankton that it eats, leaving much more for the Echizen Jellyfish to consume than in the past.
b) Over the past 100 years or so, the amount of nutrients comming out of China's Yangtsee River has risen exponentially, causing a hypernutrification of both the river, it's estuary, and the surrounding seas. This (as we know) creates an environment that allows huge amounts of algie, sometimes referred to as an 'algie bloom' to occure, along with potentially fatal low oxygen levels that may kill off more of the plankton's prediters.
c) This hyperabundance of algie, which is the foodsource for the plankton, in turn creates a hyperabundance of the plankton which the Echizen Jellyfish eats.
4) Global / Oceanic Warming (climate change)
a) The oceans have been seadily warming every year for decades, which causes two things, allowing the E.J. to live longer and also to spread over more territory by moving further north each year, which has been well documented by the Japanese fishing industry.
b) If ocean temperatures continue to rise, the Echian Jellyfish will eventually be able to survive the winter in greater numbers, allowing them to grow even larger than ever before.
So: (Human Waste) + (Overfishing) + (Warmer Oceans) = Giant Jellyfish!
What else can I help you with?
How big can a box jelleyfish get?
a box jellyfish's bell [body] can grow to be the size of a basketball and its tentacles can grow to be 15 feet.
How big a jellyfish be?
big
Do jellyfish grow?
Yes.
Do jellyfish grow in mother?
No.
How big is the arctic jellyfish?
The Arctic jellyfish is 120feet from head to tinicle.
How small can a moon jellyfish grow to be?
Nothing can GROW smaller, but it can GROW bigger. Sorry.
How big is the box jellyfish?
A box jellyfish can be about 5 ft in length of tentacles.
Do big fish eat jellyfish?
Yes, but this all depends on the jellyfish type
How big are man of war jellyfish?
4 ft to over 30 ft long.
Do crocodiles eat jellyfish?
I big no on that
What is the bell of a jellyfish?
The bell of a jellyfish is the big round part where the tentacles hang down from.
How big are jellyfish to humans?
There is no answer to this. Jellyfish, as do humans, come in all different shapes and sizes.
