What is a killifi sh? Killifi shes are
a diverse group of small, mainly
freshwater fi shes that are often found in
marginal habitats not occupied by other
fi sh species — from tropical mangrove
tidal zones inhabited by the amphibious
and self-fertilizing hermaphroditic
Kryptolebias marmoratus, to cold lakes
on the Andean plateau occupied by
the endemic Orestias species fl ock.
As adaptations to these marginal
habitats, killifi sh possess some unusual
reproductive strategies.