A good site dedicated to them, compiled by Bruce Turner, is:
http://www.bsi.vt.edu/rivmar/
TFH magazine, February 1998, ran an especially interesting article "Sex and
the Single Killifish" by Kathleen Cole and David Noakes. I'll bet their
article in Copeia 1997: 596-600 includes much the same information.
They contend, as a result of their study, that most marmoratus start out as
functional females. If they don't encounter a male with a certain period,
they also develop testes and can lay self fertilizing eggs.
In some populations males develop from the get-go. In other populations
functional hermaphrodites will lose their ovaries and become "secondary
males." There is a photo of a field caught male by Will Davis-in-that site
listed above. They also discuss hermaphroditism in several other (marine)
fishes.
Several years ago Science Magazine ran a fascinating article on their
habitat.
Google will also yeeld up a bunch of stuff. Also see that Turner site for a
biobliography.
That TFH issue is available from the Jim Forshey's Aquatic Book Store
http://www.seahorses.com/ . When I can't find aquarium literature anywhere
else, I still have a pretty good chance of finding it there.
If that doesn't work for you, e-mail me off list and I'll unwrap a copy and
(later this week) try to scan that TFH article - for purely personal
research purposes of course. :)
All the best!
Scott Davis
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