The best thing about new content being added in to Genshin Impact, is exploring all the smaller features that come with it. Thanks to the Omni-Ubiquity Net, you can now capture several different types of creatures for your Serenitea Pot. Enkanomiya introduces a world of strange new creatures, so it's no surprise that players are trying to capture them.
There is a bit of bad news in concerns to which Enkanomiya creatures you can bring home with you. There aren't a lot of animals that you can currently bring with you into your Serenitea Pot. To begin with, you can not capture the floating manta rays that glide around the islands, nor can you capture the ghostfish schools.
In fact, the only new creature that you're really going to be bringing home with you is the deep sea unagi. This is likely due to the fact that ghostfish act more as a puzzle-solving mechanism to get you to portals. The floating rays would be a bit hard to control or path in your Serenitea Pot.