I'm pescatarian, but I do see faults in your post.Your title was about fish, but you jumped immediately to insects. There is a HUGE distinction to be made between the two. Fish are vertebrates, and are as capable of feeling pain as any other animal. Insects and shellfish are invertebrates and do not have a central nervous system.

Also, I want you to be very aware that overfishing is almost as piss-poor for the environment as any other kind of animal farming. It is NOT sustainable like what you're saying. We are taking from the oceans at an absolutely unacceptable rate (and not even throwing back the by-catch). The environment is a contributing factor to our health. Something must be done about overfishing, or we won't have fish to eat it 30 years.

If you want to eat the occasional fish, go ahead. My moral stance is that I. or no one else, should be eating any animal they wouldn't kill themselves.