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You can see shimmer, it is just very subtle. Once you notice it you'll never want it off (probably).
Shimmer is the recalculation of the angle between the fish's surface and the light source. So with shimmer, the shadows on the fish change as different parts of the fish change their relationship to the light source. Without shimmer the shadows on the fish are calculated once and remain the same for the execution of the program. Notice how when the long fins of Cali face down they get darker, but when they face up they get lighter? That is shimmer.
At reasonable framerates the medium shimmer setting is as realistic as the high shimmer setting.
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