It's almost certainly impossible to create a species of fish that can take things from the ocean floor all the way to the surface for any significant percentage of the ocean. And we are certainly nowhere near having the ability to bionegineer such complex behaviors, we're far enough that you wouldn't even have a reasonable estimate for how long it might take to get there.

Why is it impossible? it can be as simple as a bottom feeder species that goes to the surface to poop, basically like whales, or have cells in their gut that produce fiber making their poop float to surface, or a combination of seaweed that produces floating wood, and a fish that builds nests on it. The second version is probably in reach of current technology.