The fish sturgeon is called "Stör" in German. The verb "to annoy" means "stören".
Most of these memes that were posted recently are puns where random German words that contain "stör" or a simmilar sounding syllable is replaced by the fish.
<º))))><
Sprich Deutsch, du Störenfried
Volkswagen hamburger
Username checks out
Ich hoffe wir stören nicht zu sehr / Hope we don't disturb you too much
*Hope we don't sturgeon you too much
*Hope we don’t distörb you too much
German Grammar Fun Fact: In german, "you" is either "dich" when directed at a single person, or "euch", when directed at a group of people (or some super stuck up noble person, which luckily dont exist anymore in todays germany).
This GGFF has been brought to you by: 🤓 the nerd emoji
German Grammar Fun Fact 2: There's a differen formal form of "you" in German. When you speak to your friend you say "du" / "dich" but when speaking to a teacher or a business associate you say "sie"
German Grammar Fun Fact 3: "Sie" is also "she" and "they" in addition to the formal "you". Which also means that it can't work like the gender neutral singular "they" in english.
Is it tuna fish? Do the Germans love tuna fish?
It's sturgeon.
I'd call it normal shit posting Community behavior.