Conditions for riffle larvae

[braga]

Has any progress been made in figuring out how to keep riffle larvae alive?

From what I've read here and elsewhere, it's not entirely clear whether it's an issue of chemistry/hardness or food.

This is a basic but important question, and I think it's easily answered by running a few experiments using water drawn from a creek where they naturally occur.

Is there anyone here that can help?

[fishmosy]

Hi braga, 

The larvae may require different conditions and/or food depending on the source of the population of the adults. In general though, providing the larvae with small food like phytoplankton, rotifers and/or other zooplankton is crucial. Water hardness can be higher than for the adults and may help when the larvae moult as they grow. Populations close to the coast may have larvae adapted to brackish and/or marine conditions.

as you said, you may need to experiment to find the conditions that work best for your larvae