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There have been studies, mainly in Australia on Barramundi. Those studies were exhaustive and found that mortality increased sharply if the fish was weighed by hanging it from its jaw in a vertical position. Post mortem study of released fish that later died showed that they primary cause of death was tearing of the tissues that hold all of the major organs in place. Mortality was sharply reduced by using a sling to hold the fish while it was being weighted.
Those Australian studies caused some much less exhaustive studies here in the U.S. on fish that were similarly shaped as the barramundi, stripers included. They confirmed the results of the Australian studies i.e. mortality sharply increased for fish weighed by hanging them from the jaw. The bigger the fish the higher the mortality. Hanging a 18 inch striper has almost no effect on mortality, but hanging a 50 sharply increases mortality.
When a fish jumps out of the water, its position is more horizontal than its position from hanging it by the jaw.
You can probably find all of the studies using Google, I lost my links to them when my old computer crashed.
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