Yes. Sea animals are lawful even when found dead, because the Quran permits the game of the sea and its food (5:96). Scholars also permit locusts, based on the hadith that two kinds of dead animals are lawful: fish and locusts.
Está-vos permitida a caça aquática; e seu produto pode servir de visão, tanto para vós como para os viajantes. Porém, está-vos proibida a caça terrestre, enquanto estiverdes consagrado à peregrinação. Temei a Deus, ante O Qual sereiconsagrados.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Can I eat fish that died by itself?
Yes. Sea animals are lawful even when found dead, because the Quran permits the game of the sea and its food (5:96). Scholars also permit locusts, based on the hadith that two kinds of dead animals are lawful: fish and locusts.