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I’m as confused as Airgetlam is and not sure what you mean by fish remote, Google doesn’t help in this regard either. Do you have any further information you could provide us with, such as the full remote name or model number?
It’s possible that this TV remote doesn’t meet our remote requirements. Please note that if you are connected via Optical, only infrared (IR) remotes will work with this connection. If you’re remote using radio frequency (RF) or Bluetooth, then you may need to programme your remote to control the Sonos volume as a separate audio device, how to do this should be outlined in the Remote Manual.