Here are some options, depending on the context:
If you're looking for an antonym in terms of edibility:
* Land animal: This could be any land-based creature that is edible, like chicken, beef, or pork.
* Fish: While abalone is a mollusk, it is often categorized as seafood, so another type of seafood like fish could be considered an antonym.
If you're looking for an antonym in terms of type of mollusk:
* Oyster: Another type of edible mollusk, though oysters are often considered different from abalone in taste and texture.
* Scallop: Similar to oysters, another edible mollusk with a distinct flavor and texture.
If you're looking for an antonym in terms of general opposite:
* Land: This would be the opposite of the sea, where abalone lives.
* Non-edible: This would be anything that is not meant to be consumed, like a rock or a piece of wood.
Ultimately, the best "antonym" for abalone depends on the specific context in which you are using it.