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There is long range infra-red: https://www.mmo-association.org/infrared

I'm involved in setting something up like this in Australian waters.

I'm actually working on a side project called Whalebernetes which will allow you to orchestrate groups of virtual Orcas to perform tasks like gather salmon or seals. These Orca groups, or Pods can then be moved between various Oceans as-needed depending on the needs of your business.

That sounds promising. Watch out, you'll also need some way to get those pods to stay where you need them, like to dock them with a harbour.

I imagine one day, if your idea really takes off, we could abstract away our fisheries activities almost entirely (for most businesses), simply doing our fishing in "The Foam". (The Foam is really just other people's water)

Maybe someday they could be viewed from an innocuous object with cameras installed. Like the remote controlled elephant dung pile cam:

https://youtu.be/LCqaFvc7rDw