Fish are not master tacticians. More like a bug with fins.
The issue hit the news when it happened: Ecological disaster! Salmon stocks at risk! Then when nothing happened, it wasn't news. So folks still cite this 'disaster' like it still actually happened.
Before rolling out these speakers on a wide scale it really needs intense study on a small scale to see if this will actually rejuvenate the reef or whether instead it just ends up destroying the viability of juvenile fish. The fish are attracted to shrimp sounds because they eat shrimp. But there are no shrimp on the dead reef. Are shrimp also attracted to the loudspeakers? Apparently not since that was not mentioned in the study. So fish go to a place with no shrimp because they hear shrimp.
> Reefs become ghostly quiet when they are degraded, as the shrimps and fish disappear, but by using loudspeakers to restore this lost soundscape, we can attract young fish back again.
This statement about their great desire to attract young fish to fix the dead reef reminds me a lot of the efforts to attract young people back to abandoned dead cities like Detroit which need the tax base to pay its high taxes and large metro bureaucracy expenses that they are unwilling to scale back. But there's still no massive numbers of manufacturing or other jobs for young people in Detroit, so young people that fall for the lure and move to a dead city see their youth squandered and career potential die. Similar to these fish who are expected to magically repair the dead reef but never get paid in actual shrimp they need to survive. In both cases the real solution is to fix the right thing. If you can get shrimp to return to the reef the fish will follow. If you can get car manufacturing or other giant jobs providers back to Detroit then the young will follow. Both those tasks are significantly harder (perhaps impossible) than just trying to lure youth to a dead city. So obviously the focus is on the easy thing. Try to lure youth and ignore that there is nothing for them there, that can be their problem.