I think it's more like a dead herring.
If they are concerned about disturbing the fish, then why are they even considering spearfishing? I think the fish will find a metal shaft passing through their body at high speed to be a tad more disturbing than the sound of a boat propellor or the glare of a dive light.
If they are concerned about disturbing the fish, then why are they even considering spearfishing? I think the fish will find a metal shaft passing through their body at high speed to be a tad more disturbing than the sound of a boat propellor or the glare of a dive light.