From a prior thread

Here is the study

There is a lot unknown about the subject of your question. There are some threads here on many aspects of that goal. Read up on catchability and growth rates. Look into the research on TPWD share a lunker genetics and studies on integration of Fla and Northern LMB in TX waters. Here is a bit to ponder.

Subspecies Composition of Angled and Electrofished Largemouth Bass in Texas Reservoirs , Dijar J. Lutz-Carrillo, and Spencer Dumont in Proceedings of the Annual Conference of the Southeast Association of Fish and Wildlife. Agencies 66:75�81, 2012 Proc . The study�s results provide biologists with a provocative concept that, in southern waters (natural integrated zone of FLMB and NLMB), FLMB likely are more difficult to angle than NLMB, but the phenotype (genetic trait) of reduced angler susceptibility (catchability) is mitigated (reduced) by introgression (genetic mixing), even at low levels of NLMB genes. While many factors may function concurrently to determine angling susceptibility, including fishing pressure, naivety of individual fish, learned lure avoidance, and stress from catch and release , we now know that catchability is a genetic and heritable trait as was previously discussed in earlier Cutting Edge articles ( see Garrett (2002) and Philipp et al. (2009) ). Note that when pure FLMB were removed from the dataset numbers (leaving only crosses with high levels of FLMB genetic influence) the trait of reduced catchability disappeared. Stated differently the addition of only a small amount of NLMB genetics caused poor catchability to disappear.
Trophy fish (≥13 lbs.) from introgressed populations are represented disproportionately as non-introgressed FLMB relative to the frequency of FLMB in the general population ( TPWD, unpublished data). Thus, in an appropriate environment, genetic composition appears to be a critical component of maximum size in largemouth bass. While most of the differences in growth and maximum size between these subspecies are likely due to intrinsic physiological differences, behavioral differences, such as reduced angling susceptibility, may also play a role. FLMB that are potentially less susceptible to angling would be removed from populations at reduced rates relative to non-introgressed NLMB or crosses, allowing a greater proportion of FLMB to reach an older age and greater size. However I recall TPWD data also showing many of the share-a-lunker fish were high FLMB percentage crosses. From Pond Boss � The Cutting Edge.