These threads kill me
First and foremost
define aggressive
1. characterized by or tending toward unprovoked offensives, attacks, invasions, or the like; militantly forward or menacing; 2. making an all-out effort to win or succeed; competitive; 3. vigorously energetic, esp. in the use of initiative and forcefulness; 4. boldly assertive and forward; pushy
Using that, aggressive does not mean tough
it has to do with evaluating attitude
So adult size should not be considered
nor should how tough a fish is
Only the tendency to make unprovoked attacks and other such behavior
Wild caught specimen should only be considered as many generations of aquarium breeding removes the benefits that natural selection / survival of the fittest has to offer which will alter the evaluations of more common (to aquaria) species
But regardless of all the scientific questions we ask or angles we consider
the true answer will always be
it varies per individual specimen amongst many different species
and anything after that is spinning your own wheels with no benefit other than misleading yourself and others
Enjoy your thread