Are apple snails edible

No, Apple snails are not poison if they bite you, the reason is because they cannot bite. They have a rough raspy tongue called a radula and they use that to scrape up and eat algae or plants depending on the type of Apple snail. They cannot bite you.

Several species are eating by humans especially in Asia but research has shown that the eggs are very poisonous.

A type of cone snail in the south pacific is very poisonous, it can sting and kill you in short time.