Not, cute cartoons are safe and will live to suffer a sequel. Nemo is now a girl.
But will disrupt the migrations of real animals that are endangered, like sharks, eels (most vanished in the last 60 years) and mesopelagic squids and fishes that play main roles in fighting human famine.
And the technology will need to find a way avoid getting cluttered by marine snow and filterers settling on it, most probably.
Maybe also not what we want, but it could be cool to see if some new ecosystems set up around these structures
You volunteering to change the filters? By definition, that's a maintenance task.
Those turbines probably move very slowly. Hard to hit or hurt anything at those speeds in the water. Sea life will be more trouble for the turbines than the turbines will be for the Sea life. Noise pollution may be an issue.