What is the brown thing in my egg?

Online Answer
What is a blood spot? It is a pinhead-sized red or brown spot on the yolk of an egg. These are caused by the rupture of small blood vessels during the formation of the egg. A blood spot does not indicate that an egg has been fertilized.
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It's good practice for managing the fishery and keeping the spot prawn harvest sustainable. If, however, you ever happen to come across spot prawns with their roe, know that they are a fabulously rich and delicious treat.