Re: IS Dead Fish Halal??
"Forbidden to you (for food) are: Al‑Maitah (the dead animals — cattle — beast not slaughtered), blood, the flesh of swine, and that on which Allaah’s Name has not been mentioned while slaughtering (that which has been slaughtered as a sacrifice for others than Allaah, or has been slaughtered for idols) and that which has been killed by strangling, or by a violent blow, or by a headlong fall, or by the goring of horns — and that which has been (partly) eaten by a wild animal — unless you are able to slaughter it (before its death) ‑ and that which is sacrificed (slaughtered) on An‑Nusub (stone‑altars). (Forbidden) also is to use arrows seeking luck or decision; (all) that is Fisqun (disobedience of Allaah and sin)”
Q & A: Sea Food in the Four Madhahib
According to the Hanbaliy and Shafi’ee scholars, all living creatures that live in the sea are halal, whether they are in the form of a fish or not. (Fiqh alal Madhaahib al-Arbaa). Based on this, oyster, oyster extract, shrimp, lobster and shark are all halal and permissible.
According to the Maliki scholars, every living creature of the sea is halal except eel. (Ibid) Hence, oyster, oyster extract, shrimp, lobster and shark are halal and permissible.
According to the Hanafi scholars, the only living creatures of the sea that are permissible are those that are in the form of a fish with an exception of the hagfish and eel. (Ibid). (these 2 even though they are not in the form of a fish they will be permissible to consume).
Hence, according to the Hanafi scholars, it will not be permissible to eat oyster, oyster extract, shrimp and lobsters. It will be permissible to consume shark as it is in the form of a fish.
IFANCA: Seafood - What’s Halal, What’s Not