The light animals are called bioluminescence.
Allah gives a likeness with the oceans, and in the way He describes oceans is exactly what have been recent discoverd. Nobody could guess something like this, and the shocking verse comes after when He desribes that there are animals that have light, but there are always people who will not believe or see it.
The beautiful recition is made by a South African brother Ziyad Patel.

40.54 A guidance and a reminder to the men of understanding.

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