Uwe,

Why don't you try the Instituto de Ecologia and/or CONACYT ?
You could send an email to Dra. Eugenia Olguin at the Instituto de Ecologia
in Xalapa [State of Veracruz]. Eugenia is a biotechnologist and an
excellent expert in algae. She works in the field of Spirulina as an
integrated part of waste --> anaerobic digestion --> algae and maybe also
algae as fish food.

You could also ask Prof. Gustavo Viniegra in Mexico City
<vini@xanum.uam.mx>, who is probably THE expert in biotechnology in Mexico.

If you write to either or both, you can very happily mention that you got
from me the advise to contact them for help. I am not sure what their
finances are, but they work in the area.

Asking questions never harms, and you may get a positive answer. Fragen
kostet nichts und mehr als ein NEIN kannst Du nicht erwiedert bekommen.

Best of Luck
Horst