Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: We went out on a military expedition and felt severe hunger, so much so that one or two dates each were distributed in the army. Meanwhile we were on the seashore. When the sea cast out a dead fish, the people cut from its meat or fat as much as they wished. That fish was like a hillock. I learned that when the people came and told the Messenger of Allah (peace and blessings be upon him), he (peace and blessings be upon him) asked: "Do you have any of it with you?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18972