All sea animals are permissible (to consume) without proper slaughter (dhakât) because the Messenger of Allah (SA) said concerning the sea, “Its dead is permissible.”1485 Excluded from this are the amphibians that (also) live on land;1486 they are not permissible until properly slaughtered, except for crabs and the like.
يُبَاحُ كَلُّ مَا فِيْ اْلبَحْرِ بِغَيْرِ ذَكَاةٍ؛ لِقَوْلِ رَسُوْلِ اللهِ فِيْ اْلبَحْرِ: "هُوَ الحِلُّ مَيْتَتُهُ" إِلاَّ مَا يَعِيْشُ فِيْ اْلبَرِّ، فَلاَ يُبَاحُ حَتَّى يُذَكَّى، إِلاَّ السَّرَطَانَ وَنَحْوَهُ