So, that thing is a Cardinal Fish. It just ate something called an Ostracod. The Ostracod lets off a bright blue light. Because the Fish doesn't want to be glowing blue (because predators) it spits out the Ostracod/ Blue Light
As per the Imgur link: http://www.bbc.co.uk/programmes/p024m0s1
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hophin
Aug 31, 2014 at 06:35PM EDT
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Sep 01, 2014 at 07:18PM EDT