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]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / Q10027
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
Ibn Jurayj (may Allah have mercy on him) said: I said to Ata (may Allah have mercy on him): What is your view about the game of rivers and of flood-water pools; is it game of the sea? He said: Yes. Then he recited to me: "This one is sweet, fresh and pleasant to drink, and that one is salty and bitter; and from each you eat (by catching fish) fresh meat." [Surah Fatir: 12]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10028
Ibn Jurayj (may Allah have mercy on him) said: Ata (may Allah have mercy on him) was asked about the pool of al-Qasri, which is a huge pool in the sanctuary: may one hunt in it? He said: Yes, and I wish we had some of it with us now.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10029
Ash'ath narrates from al-Hasan (may Allah have mercy on him) that he saw no harm in a person in ihram slaughtering a bird which, if left alone, would not fly, such as the duck and the hen; and he disliked slaughtering one which, if left alone, would fly, such as the pigeon and the like.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10030