Rad, my explanation of over stressed fish caught on light tackle, is based on personal experience.
Perhaps the experts will give a scientific explanation.

A good example are Striped Bass, as well as their hybrid bass offspring, will fight to their death on light tackle unless landed quickly and resuscitated before release,

Lactic acid builds up in their system and they �cramp� and suffocate when released without resuscitation.

Tight lines... \:\)