[Quinn]

While obviously fish can hear (the research shows this) and become stressed by sounds (loud volumes), to say they have any ability to "enjoy" sounds is pretty far-fetched. The quality/quantity of "enjoyment" or "happiness" is difficult to quantify at all in any animal. If there is any benefit to pairing fish with music, I think it would be the potential of the aquarist to associate good music with tending to their aquarium and the associated increase in general wellbeing of the tank one could expect. So if there is any relationship between music and fish health, I would attribute it to this third factor. On the same topic, for what it's worth, I have sometimes heard in the past and repeated that only certain specific animals actually "enjoy" sex. I checked into this a while back and found that it's a myth, obviously we have no real way to test this. So if you were wondering whether it was just chimps or dolphins as well...