Yes. The Quran permits the game of the sea and its food (5:96), and the Prophet ﷺ said of the sea that its water is pure and its dead are lawful. Most scholars treat all sea animals as halal. The Hanafi school permits fish but is stricter about other sea animals, so scholars differ in detail.
Lawful to you is game from the sea and its food as provision for you and the travelers, but forbidden to you is game from the land as long as you are in the state of ihram. And fear Allah to whom you will be gathered.
And it is He who subjected the sea for you to eat from it tender meat and to extract from it ornaments which you wear. And you see the ships plowing through it, and [He subjected it] that you may seek of His bounty; and perhaps you will be grateful.
Hadith
Jami' at-Tirmidhi 69Grade: Ahmad Muhammad Shakir: Sahih · Al-Albani: Sahih · Bashar Awad Maarouf: Hasan Sahih · Zubair Ali Zai: Isnaad Sahih
Abu Hurairah narrated:"A man asked Allah's Messenger 'O Messenger of Allah! We sail the seas, and we only carry a little water with us. If we use it for Wudu then we will go thirsty. So shall we perform Wudu from the (water of the) sea?' Allah's Messenger said: 'Its water is pure, and its dead are lawful
Arabic text (with chain of narrators)
حَدَّثَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، ح وَحَدَّثَنَا الأَنْصَارِيُّ، إِسْحَاقُ بْنُ مُوسَى حَدَّثَنَا مَعْنٌ، حَدَّثَنَا مَالِكٌ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، عَنْ سَعِيدِ بْنِ سَلَمَةَ، مِنْ آلِ ابْنِ الأَزْرَقِ أَنَّ الْمُغِيرَةَ بْنَ أَبِي بُرْدَةَ، وَهُوَ مِنْ بَنِي عَبْدِ الدَّارِ أَخْبَرَهُ أَنَّهُ، سَمِعَ أَبَا هُرَيْرَةَ، يَقُولُ سَأَلَ رَجُلٌ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ يَا رَسُولَ اللَّهِ إِنَّا نَرْكَبُ الْبَحْرَ وَنَحْمِلُ مَعَنَا الْقَلِيلَ مِنَ الْمَاءِ فَإِنْ تَوَضَّأْنَا بِهِ عَطِشْنَا أَفَنَتَوَضَّأُ مِنْ مَاءِ الْبَحْرِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " هُوَ الطَّهُورُ مَاؤُهُ الْحِلُّ مَيْتَتُهُ " . قَالَ وَفِي الْبَابِ عَنْ جَابِرٍ وَالْفِرَاسِيِّ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ . وَهُوَ قَوْلُ أَكْثَرِ الْفُقَهَاءِ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم مِنْهُمْ أَبُو بَكْرٍ وَعُمَرُ وَابْنُ عَبَّاسٍ لَمْ يَرَوْا بَأْسًا بِمَاءِ الْبَحْرِ . وَقَدْ كَرِهَ بَعْضُ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم الْوُضُوءَ بِمَاءِ الْبَحْرِ مِنْهُمُ ابْنُ عُمَرَ وَعَبْدُ اللَّهِ بْنُ عَمْرٍو . وَقَالَ عَبْدُ اللَّهِ بْنُ عَمْرٍو هُوَ نَارٌ .
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is seafood halal?
Yes. The Quran permits the game of the sea and its food (5:96), and the Prophet ﷺ said of the sea that its water is pure and its dead are lawful. Most scholars treat all sea animals as halal. The Hanafi school permits fish but is stricter about other sea animals, so scholars differ in detail.