Poisonous fish will have poison gland on them.
The puffer fish, while popular for lampshades, is poisonous. DO NOT EAT PUFFER FISHES!
No, it is not edible.
It's a fish and is not poisonous, so you can eat it (making it edible). Whether or not the meat is tasty, nutritious, or plentiful enough to consider harvesting is up to the chef.
They are edible
No, it's poisonous.
casava
Well, some are poisonous and some are edible to humans.
Yes it is edible
Almost all types of fish are edible. There are certain species that are poisonous, and can't be eaten, or only select parts of the fish can be eaten while the rest of the fish will kill anyone who eats that part of the fish.
Do not eat them. They are poisonous.
Rhubarb
No. poisonous in large doses.