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.
तुम्हारे और काफ़िले के वास्ते दरियाई शिकार और उसका खाना तो (हर हालत में) तुम्हारे वास्ते जायज़ कर दिया है मगर खुश्की का शिकार जब तक तुम हालते एहराम में रहो तुम पर हराम है और उस ख़ुदा से डरते रहो जिसकी तरफ (मरने के बाद) उठाए जाओगे
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.