If you hunt an animal and kill it, you should clean it and eat it IMHO. Failing that, give it to someone or something to eat (pet food/bait/chum/...). [Lateral thought: if you just threw it back in the sea, chances are something would eat it - crab, shark, seabirds, bacteria,...:hmm]Would it change people's minds if the hunt were for trophy fish? And not necessarily for consumption?
OMD gaves some examples of what seemed quite ethical forms of scuba equipped spearing on an earlier thread -- I wouldn't rush to judge others.
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