Can I eat fish that died by itself?

Halal Food & drink Quran · 1

Short answer

Yes. Sea animals are lawful even when found dead, because the Quran permits the game of the sea and its food (5:96). Locusts are also lawful: Ibn Abi Awfa said, “We fought seven battles with the Messenger of Allah ﷺ and we ate locusts” (Bukhari and Muslim).

Evidence

Quran

أُحِلَّ لَكُمْ صَيْدُ ٱلْبَحْرِ وَطَعَامُهُۥ مَتَٰعًۭا لَّكُمْ وَلِلسَّيَّارَةِ ۖ وَحُرِّمَ عَلَيْكُمْ صَيْدُ ٱلْبَرِّ مَا دُمْتُمْ حُرُمًۭا ۗ وَٱتَّقُوا۟ ٱللَّهَ ٱلَّذِىٓ إِلَيْهِ تُحْشَرُونَ ﴿٩٦﴾

To hunt and to eat the fish of the sea is made lawful for you, a provision for you and for seafarers; but to hunt on land is forbidden you so long as ye are on the pilgrimage. Be mindful of your duty to Allah, unto Whom ye will be gathered.

This is general information, not a fatwa. For your own situation, ask a qualified scholar.