Jews who keep kosher don't eat fish wihout scales (Deuteronomy ch.14).
Fish that have fins and scales
No. For a type fish or seafood to be Kosher, it must have fins and scales.
It doesn't matter what kind of restaurant it is. That's not relevant to what Jews eat. Consider this:Orthodox Jews will not eat in unkosher restaurants at all, unless they find themselves in a place where that is the only choice. In that case, they would typically only eat vegetarian cold food on clean cold plates, such as plain salads without dressing, raw vegetables, fruits and nuts. Some may eat kosher fish, if it is unseasoned. Kosher fish are fish with fins and scales.Non-Orthodox Jews who keep kosher will often eat dairy, vegetarian, and kosher fish even with seasoning. (Kosher fish have fins and scales).Non-Orthodox Jews who don't keep kosher will eat whatever they want.
the meat of any fish with fins and scales.
because it is against the Torah-law
The Torah permits us to eat fish that have fins and scales (Deuteronomy ch.14). No shellfish. See the attached Related link for a full list.
the scales cover the fish's body so it would be skin of the fish or another layer.
Observant Jews do not eat crayfish.
i am guessing it is the teeth and the scales that you cant eat.
No not technically. It depends on what you consider fins. Shellfish are called shellfish for the reason that they have shells. Lobster do have a sort of "Flipper" on their rear. I don't believe it is a fin but it depends on your view. The only reason I can think of for asking this is because of the Biblical dietary prohibition on eating fish without fins and scales. Observant Jews do not eat shellfish because of this.
No, unless it is artificial flavoring. Prawns and other shelfish are not kosher. The only kosher seafood are fish that have both fins and scales.
You definitely don't want to eat scales and bones!!!