Identifying a Kosher Fish

What is the main halaka about fish in terms of  buying fish and eating fish? For those of you   with the super short attention span, here's the  takeaway that I really need you to come home with.   The definition of a kosher fish practically  when you're trying to figure out if fish is   kosher. You're looking to check if the fish has  scales that can be removed from the fish without   ripping the skin. The garland says yes cases  yes snap earier. Anything which has cases a   scale as I defined it will have snap earier. So  we don't have to check for snapper practically.   What we do need to check is to make sure that it  has scales that can be removed without ripping   the skin. And there are conditions for that.  And there are things you have to think about   and what if the scales fall out? What if the  scales were scraped off and I didn't see them   before they were scraped off? And other ways  that we can manage all of those things. But   that is the most important thing. And that when  you're buying fish other than salmonided fish,   you have to make sure that it's a Doug  tar before they take the skin off.