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This could be fish allergy or it could be just indigestion since he ate a lot as you say for his age. Since there was no rash or itch, you can try giving smaller portions next time and see if this too causes vomiting. Also if there is mild acidity or gastric reflux in this sibling too, then fried and oily food can trigger vomiting. If symptoms persist next time too, then yes, you would need to pursue it further. Sometimes one has allergy to sea fish and sea food but tolerate fresh water fish.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!