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The jelly fish accessed this lake through a cave(which no longer exists) from the sea long ago. They have evolved not to be poisonous due to an environment with no predators, and feed by photosynthesis.
http://www.videosift.com/video/My-God-its-full-of-Jellyfish
I'm amazed at how much conjecture and 'consensus' is taken for science now days.
Remember this, in the time of Galileo science was absolutely positive that the universe (planets, sun, etc.) revolved around the Earth. They had the models, charts, and mathematical formulas, to prove it, and they all worked. They also had those in power fully supporting their theories as fact. The problem is, they were wrong, despite their models and complicated formulas. Today it's no different, except complicated charts and models are replaced with computer models that are just as 'without a clue' and lacking in any real science as those of old.
Science knows far too little to be able to claim 'this is how it happened' without any real cold hard scientific proof. Otherwise it's an 'educated guess' despite the number of degrees the person(s) may have and how many other scientists may agree with them (have a consensus). It still doesn't make it any more true, it's just a theory.
With that said, all of your figures and models can be fit together beautifully and 'work' flawlessly to 'prove' a point, yet you can be totally wrong anyway.
Sorry, I followed a tangent way too far, but remember that next time someone tries to tell you they know how to predict climate and what's going to happen in the next 10 years.
What's that have to do with jelly fish? I have no clue... oh yeah, they came from a cave that doesn't exist anymore.
Seems you may be confusing the whole "theory" issue.
How about the description is actually a little out, in reality these islands rose out of the ocean as small islands are a want to do, and this lake was created as it happened, also through changes in sea levels. (http://www.fishnfins.com/Jelly%20Lake.html)
Now, a lake which is not kept fed by sea water will usually become fresh water over time via evaporation, except in this case:
"Fissures in the limestone island allow for the transfer of saltwater from the ocean, yet keep other forms of aquatic life outside."
So, yeah, we kinda do know how it came to pass.
Says the man, citing his formulas, evidence and observations