Like everyone else, individual Jews can and do eat anything they want that's
available and affordable. Those who choose to adhere to Jewish law limit their
food choices to kosher items.
There are several kosher species of fish. They include trout, haddock, pike, salmon,
whitefish, carp, halibut, herring, tuna, snapper, sardine, and cod, among others. If
a species doesn't "look like a fish", then one can be pretty sure that it's not a kosher
species. Non-kosher species of 'seafood' include clam, oyster, lobster, mussel, scallop,
eel, crawfish, squid, octopus, prawn, and shrimp, among others.
Observant Jews do not eat crayfish.
Fish that have fins and scales
Jews who keep kosher don't eat fish wihout scales (Deuteronomy ch.14).
Yes.
yes they can
No, monk fish has been determined to be non-kosher.
At the time of the Mishna (200 CE), rabbis deemed it meritorious to eat fish on the Sabbath and Jews became accustomed to eating fish at festive meals. Gefilte fish, which has been called the quintessential Jewish food, is an especially popular fish to serve at the Passover Seder meal.
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.
Beef, chicken, fish, lamb, venison. It is worth noting that there is no magical food that Jews replace pork with, it's just that they do not eat dishes made with pork and therefore will eat different dishes than non-Jews who do eat pork.
Gefilte fish is eaten on Sabbath and Festivals throughout the year. It has no specific relevance to Passover.
Jews eat fish any day of the week. Since fish is considered a delicacy, it features prominently on the Sabbath menu; most Jews will tell you that the Sabbath meal is not complete unless fish is served. This is in addition to the tradition of serving at least two types of meat for Shabbat (Friday night) dinner. Fish is usually served on Friday night, Saturday morning and again on Saturday afternoon. Note that Jews will not eat fish and meat together; they will always be served on separate plates with a different set of cutlery. Between the fish and meat course most Jews will be carefully to eat some bread and drink something.
No. For a type fish or seafood to be Kosher, it must have fins and scales.