From another thread FYI. The LMB you are holding does not look like it came from an overcrowded situation. But it is wise to stay ahead of overcrowding.
For LMB
This is what is suggested by Dick Anderson - the Prof who wrote the book on PSD.
Keep taking <12 in bass until the number 8-12 equals number 12-15.
Ideal pond structure is 40% 8-12, 40% 12-15 and 20% 15+
This assumes good fish condition.
Another suggestion is take out all the fish in poor condition in all size groups. Note the size group that is stunted will have a much higher % of fish in poor condition.
These are all correlated to the concept of RW mgt.
Here are 3 archive links with a ton of info on the subject.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=255372#Post255372http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=255359 http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92492#Post92492 If the only method of removal is hook and line then you need to consider the catchibility issue which underlies your question about genetics.
Look for threads here on catchability. The info is here as is the research.
Here are a couple with links
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=274175&page=1http://forums.pondboss.com/ubbthreads.ph...true#Post200220http://forums.pondboss.com/ubbthreads.ph...true#Post260622