Frozen Fish
Question :

What is the prohibition on eating fish [with scales] that is sold as frozen even though one is unaware that it is caught dead or alive?

Answer :

If it is not known that the fish was caught alive, then it is prohibited to consume. Such knowledge could be obtained by learning about the method of fishing, as they generally catch fish alive from the water.

Crab, Lobster and prawn
Question :

Is it permissible to eat crab, lobster or prawn?

Answer :

Amongst seafood, it is unlawful to consume anything but fish that have scales as well as shrimps and prawns. Other types of fish and shellfish are not lawful.

Fish in a Restaurant
Question :

While having a meal in restaurants, If the waiter or the manager tells us that the fish has scales, can we believe him and eat the fish?

Answer :

It is permissible to rely on whoever possesses the fish, if they have not been accused of lying, or there is no other reason to believe in their dishonesty.

Colored Fish
Question :

Is it permissible to eat colored fish?

Answer :

If the fish has scales then it is permissible to consume it.

Modified Fish
Question :

If scientists genetically modify a fish that has no scales originally to produce (give birth to) fish that have scales, will those fish with scales be permissible to eat?

Answer :

It is prohibited to consume fish that does not have scales. It is permissible to consume fish that have scales, even if they have them through genetic modification.

Spawn
Question :

Is it permitted to buy and consume spawn of fish which have scales?

Answer :

It is a condition in the permissibility of consuming the eggs of the fish that they are taken from the water alive. If purchasing the spawn is not for the purpose of eating them, then it is permissible to do so even if the fish was not taken from the water alive.

Artificial Crab
Question :

Artificial Crab is used in sushi food; is it halal to eat?

Answer :

If the fish that is used in the making of such products is halal, it is permissible to consume such a product. If it is not, then it is not permissible to consume it.