Philosopher Julian Baggini wonders what the moral implications of in vitro meat will be:
If IVM is the greenest, most animal-friendly meat, yet it is even more artificial than a pitiful, intensively reared broiler chicken, then no one can maintain the fantasy that bucolic nature has a monopoly on good, ethical food.
And this article suggests that overfishing and the depletion of fish stocks really is posing a moral dilemma for responsible lovers of Sushi:
It has not always been so in demand, Newfoundland bluefin used to be fed to cats. But now tuna fuels the global appetite for sushi. The International Union for the Conservation of Nature estimates that the Pacific bluefin population has declined by 19-33% over the past two decades, mainly to satisfy demand for sushi and sashimi.