Sa'd al-Harithi, the freed slave of Umar bin al-Khattab, said: I asked Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) about fish that kill one another or that die from the cold. He said: There is no harm in them. Sa'd said: Then I asked Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both), and he said the same.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18987