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Great Picture Nebe!!
Because there is air in your mask or goggles between your eyes and the glass and the water , everything gets magnified. I used to know how much but not sure , maybe 25%?? A diver learns pretty quickly to factor that in when sizing up something in the water. When we took lobsters by scuba diving , the difference between taking 30 legal on an hour of air and just measuring 30 shorts in that hour was the ability to discriminate about a 1/4 of an inch. If you have ever done it , there are a gazillion about an 1/8 of an inch too small. If you waste your time grabbing them and measuring , your air will run out while you waste time. You learn in about 1 dive what a lefgal one looks like under water , even with the magnification do to the index of refraction.
Now if you can learn the difference between a lobster 1/8 inch under vs 1/6 inch over , what makes you think a diver can't learn which fish are 30 inches vs one at 27 7/8". At least as a diver they get to see the thing before they shoot it. A fisherman tosses out his offering and has no idea what will bit it until he reels it in.
Now there are probably divers who just shoot at anything and don't care just like there are guys who catch short stripers on rod and reel and drop kick them back into the water or step on them to keep them still to take out the hook. There's nothing you can do about those "one in every crowd" kind of guys. Doesn't matter if they are using a handine , rod and reel or a speargun , they just don't care about returning the fish alive. I don't think most divers fit that mold any more than most fisherman.
. I do understand they can take up a good spot where 10 boat or surf guys could fish but boaters also take up spots where surf guys can fish and fly fisherman take up anough space for 5 spincasters to fish. That's just the nature of the game.
There is no reason why divers should not be able to take a fish , same as a rod and reel guy
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