potamophile

noun2

1. •
   That which prefers or occurs only in freshwaters.

   • Strombomonas is apparently a potamophile alga, but does occur in still waters. — 1964
2. •
   (rare) One who loves rivers.

   • Yachting enthusiasts, potamophiles should request further detailed information and illustrated brochure from:[…] — 1964