There's a little confusion in your question:
* The Ark: This typically refers to Noah's Ark from the biblical story. Fish wouldn't have been on board because the Ark was designed to save land animals from a flood. Fish already lived in the water.
* Arch: This could refer to a structure, but it's not a specific term related to a ship or vessel.
To help me answer your question, please clarify:
* What type of Arch are you referring to? Is it a specific ship or structure?
* What kind of fish are you asking about? Are you interested in fish being stored, transported, or something else?
Once you provide more details, I'll be able to give you a more accurate answer.