Yes they do.
I saw this with other species of Rivulus in drying rain pools in the
Peruvian rainforest downstream of Iquitos. The fish weren't in the pools
themselves, but in the leaf litter surrounding them. When placed into
plastic killie bags, the Rivulus spent almost all of their time stuck to the
side of the bag above the water line. They do the same in the aquarium; just
lower the water level by a few inches...and make sure there's a over on the
tank!
Dave Schleser told me he saw Rivulus in the wild feeding in a most
impressive manner. They'd hop out of the water into the leaf litter or land,
wait to be covered by ants, then hop back into the water and eat the ants!
Not as cool as land sharks, but still impressive.
Chris Scharpf
Baltimore
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