Will get some info and post. I think the reference to 30 years was in error and should have stated Striped Bass not HSB.

IIRC the max life span is 8 years. We all know that stress effects longevity. If any of the common pond stressors (like what you listed) is severe and long term fish will suffer.

From SRAC (university fishery scientists) Fact Sheet 300

Hybrid striped bass grow when
water temperatures are above 15° C.
However, optimum growing conditions occur when water temperatures are 25 to 27 C. Hybrids grow
rapidly during their first two years of
life. Growth to 275 to 375 mm in
length and 225 to 350 grams in the
first year and 450 to 550 mm in
length and 1 to 1.5 kg in the second
year is common. Growth rate
declines rapidly with increasing age
and is similar in males and females.
Maximum reported weight for a
hybrid striped bass is approximately
10 kg. The typical size of hybrids
caught by fishermen generally ranges from 2 to 5 pounds, but fish in
the 10 to 15 pound range are not uncommon. The usual life span of
hybrid striped bass is 5 to 6 years--
more similar to white bass than to
striped bass (30 to 40 years).