Is osteri vegan?

"Osteri" is the Finnish word for oyster, referring to a group of saltwater bivalve mollusks. These marine animals are harvested from ocean waters or raised in commercial aquaculture farms. Food manufacturers use whole oysters in canned seafood products, or they extract their juices and solids to create flavorings, broths, and condiments, most notably Asian-style oyster sauce. The term osteri appears on Finnish-language food packaging for canned shellfish, savory dipping sauces, marinades, instant noodle seasoning packets, and prepared frozen or chilled meals.

osteri is not vegan because it is derived entirely from animals. Biologically, oysters belong to the animal kingdom under the phylum Mollusca. A vegan diet excludes all forms of animal life, including marine mollusks, shellfish, and any derivatives produced from them. Any food product listing osteri contains animal tissue or extract and is therefore unsuitable for vegans. Plant-based alternatives, which typically utilize mushrooms to replicate the savory flavor profile of oyster sauce, are used instead for vegan formulations.