I would think that the bass that got caught twice would be the aggressive one and the bass not caught yet the worthless one....
Also in terms of hookshyness, the most hookshy fish I have observed are fish that regularly interact with humans and have been caught alot when young. they will still bite, but not when they are looking right at you...
I completely agree n8ly! Like ewest said, fin clip or tag the ones that you catch, and use a shock boat to remove the others.
If you use numbered floy tags, you can identify each individual fish, and could keep a log as to what you caught it on, length, weight, etc. When the fish slows down it's growth or stops growing, replace it.
