fichen is not a German word, the closest is fischen, meaning to fish
Aquarium as in fish-tank means "Aquarium"
The fish "coley" (Pollachius virens) is commonly called "Seelachs" in German,use of the word "Köhler" in this context is more seldom as it has other meanings as well.
English: "the tuna fish" is German: "der Tunfisch".
Chre is not a German word
The surname Blitz comes from Germany. It comes from the German word plotz which is a type of fish. It was often the name of a person who was a fisherman or who was thought to have looked like a fish.
The German word for "Who" is "Wer".
The German word for their is "Ihre."
"mit" is the German word for "with".
The word FROM in German is von
The word for is in German - " ist "
The German word for he is er.