Scholars differ. Most hold that all sea animals are lawful, because the Quran says that the game of the sea and its food are permitted (5:96). The Hanafi school allows only fish and not other sea animals such as shrimp, though many Hanafi scholars today permit shrimp. Follow the view of the school or scholar you rely on.
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.
اوست كه دريا را رام كرد تا از آن گوشت تازه بخوريد و زيورهايى بيرون آريد و خويشتن بدان بياراييد، و كشتيها را بينى كه دريا را مىشكافند و پيش مىروند تا از فضل خدا روزى بطلبيد، باشد كه سپاس گوييد.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Are shrimp and shellfish halal?
Scholars differ. Most hold that all sea animals are lawful, because the Quran says that the game of the sea and its food are permitted (5:96). The Hanafi school allows only fish and not other sea animals such as shrimp, though many Hanafi scholars today permit shrimp. Follow the view of the school or scholar you rely on.