Allah Almighty says: "Hunting the game of the sea and its food have been made lawful for you, as a benefit for you and for travellers; and hunting the game of the land has been forbidden to you as long as you are in the state of ihram." [Surah al-Ma'idah: 96]
Abu Mijlaz narrates from Ibn Abbas (may Allah be pleased with them both) concerning "the game of the sea and its food" [Surah al-Ma'idah: 96] that its food means what the sea casts out.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10027