Thanks Rykat for getting this back to the issue.
You confused me when you said there are many other ways of harvesting fish less detrimental than spearfishing and then sighted shrimp trawling which I feel we both agree is more detrimental. It just confused me, seemed contadictory.

I stand by my position that spearfishing is the least detrimental to the species as a way of harvesting as opposed to any other method.