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.
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.
E foi Ele Quem submeteu, para vós, o mar para que dele comêsseis carne fresca e retirásseis certos ornamentos com quevos enfeitais. Vedes nele os navios sulcando as águas, à procura de algo de Sua graça; quiçá sejais agradecidos.
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.