I think the actual Florida designation of Riv. marmoratus is "of special
concern." The AFS lists it as "vulnerable." It should be noted that such
designations are not necessarily based on rarity, but on the vulnerability
of its habitat. In Florida, many coastal habitats have been lost to human
encroachment and development. So while the fish isn't particularly rare
where it's found, its habitat is shrinking.
Chris Scharpf
Baltimore
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