Can you tell if a fish is poisonous to eat when cooked?

Question

In a survival situation, how could you tell if a fish is poisonous?

Answer 1

If a fish has both fins and scales, it is safe to eat. Some fish with only one (such as shark) may be eaten without being poisoned but if you cannot tell one fish from the next, follow what the bible says is acceptable (fins and scales). Even the lifeboat manuals during WW II included this as a guide for sailors who had to abandon ship.

Answer 2

most wild fish (if your talking about that) is not poisonous but i say just Google the fish your looking for or fish you will find the are to see if there edible but really the only fish that is edible and poisonous is puffer all the other poisonous fish are exotic or rock fish

Answer 3

One way might be to put a little bit of it in your mouth and see if you feel a burning sensation or something. But I don't know, it might be dangerous.

But the best precaution against this would be (if possible) to research on the wildlife in that area and see which species you can eat or must avoid. Check survival guides or something.

Answer 4

give a piece to the cat ,see what happens
If you happen to have a cat whilst being in a survival situation

I always just touch things with my tongue and hope my brains know more than I do and will give me a sign ,that something is poiseness
like with mushrooms
And i am still alive
this is the baby and genetic info-method