Theorie:

To speak about seafood, you need the appropriate vocabulary.
  
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Plaice – Scholle

Crab – Krabbe

Shrimp – Garnele

Salmon – Lachs

Grouper – Barsch
 
Lobster – Hummer

Sturgeon – Stör

Sardine – Sardine

Herring – Hering

Pike – Hecht
 
Oyster – Auster

Trout – Forelle