I don't think fishing, eating meat or other similar activities are much of a problem to the world as say, global warming or threats from space, actually, I doubt they're a problem, while it is true humans can survive with a meat free diet, addittional protein supplements would have to be purchased, which many cannot afford, and even then, not every single necessary protein will be supplied by this medication, nor will they balance the lack of energy cmoing from eating only vegetables, so in my opinion, fishing and other activities should not be considered a problem unless it is done in exxagenration, which is not the case