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.
شكار دريايى و خوردن آن به جهت بهرهمند شدنتان از آن، بر شما و مسافران حلال شده است. و شكار صحرايى تا هنگامى كه در احرام هستيد بر شما حرام شده. از خداوندى كه به نزد او گرد آورده مىشويد بترسيد.
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.