Raspberry peanut butter mead, this happened after racking into tertiary. Primary and secondary had raspberries freefloating in the container, so it miiiight just be floating bits of raspberry. When I shake it up, they briefly sink and float back up.
Use your nose that'll be more reliable than visual. And generally if it's not fuzzy it's not mold. If you're really worried just don't drink it. But to me it looks like pulp or maybe pectin