Sharks, rays, eels, and catfish are all good examples of fish (in the traditional sense) that are non-kosher.
Yes, tuna is a kosher fish. Canned tuna must be kosher certified though.
Yes, because tunas have scales and fins which are required in order for a fish to be considered kosher.
Yes, yellow tail is a kosher species of fish.
Yes, Ono, also known as Wahoo, is listed as a kosher species of fish. It belongs to the species group of mackerel and tuna.
Yes, unless there are any added ingredients which are not kosher. Not all brands of tuna are kosher so you would have to check for a valid hechsher (kosher symbol) on the packaging.
No. Tuna are a fish and fish do not have legs.
Kosher fish have fins and scales. I've attached a related link that provides a comprehensive list of kosher fish.
Fish and chips can be kosher if it`s made with kosher fish in a kosher kitchen. In fact, it was Portuguese Jews who introduced fried fish to England.
Fish and chips can be kosher so long as the fish used is a kosher species and the food is prepared in a kosher kitchen with all kosher ingredients.
from a tuna fish can
The signs of a kosher fish are scales and fins. If the fish does not have either of these, then it is not a kosher fish. If it does, it is a kosher fish and one may eat it provided, of course, that it was prepared with kosher ingredients. According to "kashrut.com" (see link in related link section), the Grouper is indeed a kosher fish.
You can get four tins of tuna out of one tuna fish.