In recent years, you may have come across people on social networks or forums sharing a picture of a fish expelling a luminescent Hadouken against the wall of an aquarium. This practice has been related to Dragon Ball and Son Goku’s Kamehameha.
If you watched the video without context, it was likely tied to the claim that it is a defense mechanism of the fish in question, a way to scare away predators with its striking attack. However, in reality, we are not dealing with a way to defend itself.
What you can witness in the video is not something caused directly by the fish itself. Instead, it is a fish vomiting a form of life called ostracods, tiny crustaceans that can produce this type of light.
When the fish eats the ostracods, they start to glow inside the fish, making it an easy prey for predators in the underwater darkness. To avoid attracting attention, the fish is forced to vomit what it has just eaten.
Since the fish does not know what type of ostracod it’s eating, and not all of them have bioluminescence ability, it is forced to throw away its last bite from time to time. Therefore, the hero with Son Goku-like superpowers is not the fish, but the small crustacean that saved its life.
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