I think that saying that nature should evolve without help or harm of humans is a bit unrealistic. There are over 7 billion people on earth, and after-all aren’t humans apart of nature, too? While I understand your sentiment, 7+ billion people to feed is a lot.The domestication of livestock, and the cultivation of the majority of plants we eat today, are why the population has grown so much. Without breeding animals & plants to be much more efficient than their wild counterparts, many humans would have starved. The domestication of fish is really the next step in humans manipulating the wild to produce more food. I agree with you that this has potentially very damaging effects, but it’s more complicated than simply saying humans should stop interfering with nature, because we already have for centuries, and it’s clear that it’s not going to stop.