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North American Journal of Fisheries Management 28:516�522, 2008
Copyright by the American Fisheries Society 2008
Physiological and ecological differences among
FLMB, NLMB, and their hybrids have been documented.
For example, they exhibited different critical
and chronic thermal maxima (Fields et al. 1987) and
different mortality rates when held at low temperatures
(Carmichael et al. 1988). In addition, FLMB and
NLMB differ in the timing of spawning, growth rate,
reproductive success, and survival (Isely et al. 1987;
Gilliland and Whitaker 1991; Philipp and Whitt 1991).
Performance differs among endemic units within the
historic range of FLMB and NLMB. For example,
growth and survival differed between progeny of
parents from different drainages in Illinois (Philipp
and Claussen 1995). Similarly, swimming performance
differed between Illinois and Wisconsin populations of
bass (Cooke et al. 2001). Lastly, the survival, growth,
and reproductive success of the local stock were higher
than those of the nonlocal stock when comparing
performance among Wisconsin, Illinois, Texas, and
Florida populations at each locale (Philipp et al. 2002).
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