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What happens when fish trapped inside a jellyfish

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This poor fish trapped inside a jellyfish, photographed off the coast of Australia’s Byron Bay at the end of last year. Photographer Tim Samuel stumbled across this incredibly rare phenomenon while free diving with videographer Franny Plumridge, and the image went viral this week.
The fish was actually able to propel the jellyfish forward and control its direction from its see-thru prison.

“The fish was trapped in there, but controlled the jellyfish’s movement,” Samuel wrote on Reddit.
But he said the fish would have a difficult time swimming in a straight
line. “The jellyfish would knock him off course though, and every now
and then it would get stuck swimming in circles.” 

It’s one of the first times this behaviour has been caught on camera in this region, as far as experts know.  
“I knew I had stumbled upon something pretty special, but I didn’t
realise no one had photographed this behaviour before, and I haven’t
heard of anyone ever seeing this before,” Samuel told Mashable Australia.
It’s hard to identify the species of fish or jellyfish from these
photos alone, but Ian Tibbetts, a fish biologist from the Centre of
Marine Science at the University of Queensland, told Australian Geographic that the jellyfish appears to be a type of stinging jellyfish known as a cubomedusan
And the fish appears to be a juvenile trevally,
which means – despite appearances – it might have actually got
up-close-and-personal with the jellyfish intentionally, rather than
becoming trapped by accident. 
That’s because young trevally are known to seek shelter among the stingers of certain jellyfish species, to help protect them from predators. Although they usually don’t end up right up inside them. 
The good news is that the fish is probably way too big for the
jellyfish to actually eat with any ease – with most preferring to move
smaller organisms such as plankton, brine shrimp, or fish eggs into
their stomach.
The bad news is that means the fish might have also interrupted
the jellyfish’s feeding. Or maybe it’s a yet-to-be-discovered symbiotic
behaviour that benefits both of them somehow – researchers will have to
investigate further. 
So what was the fate of this poor unfortunate duo? We’ll never
know, but Samuel insists that despite his initial instincts, he decided
to leave the pair alone.

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