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.
Fish, chips and mushy peas (but only on Fridays), otherwise jam sandwiches
Yes, Catholics traditionally abstain from eating meat on Fridays as a religious practice, and often choose to eat fish instead.
Catholics eat fish on fridays during lent as a sacrifice because Jesus went 40 days in the desert without food.
Friday Fish Fry. On Fridays it is common for people to go out to eat on Fridays and order fried or broiled fish (usually a white fish).
sort of (during lent you can eat it on fridays)
Observant Jews do not eat crayfish.
Catholics traditionally eat fish on Fridays as a form of abstinence from meat.
Fish that have fins and scales
Jews who keep kosher don't eat fish wihout scales (Deuteronomy ch.14).
yes they can
Yes.
Actually Catholics are not bound to eat fish on Fridays during Lent. Catholics are bound to a fast(abstention) of meat. Fish is the only permitted meat because it was viewed back when this tradition was started, as a common, cheep food. The whole purpose of the fast is to humble ourselves and put emphasis on Jesus' Resurrection and Crucifixion.