Amazing Stingrays
An e-mail list devoted to stingrays including their maintenance in home aquaria.
Cowfish, Puffers
E-mail list devoted to Tetraodontiformes: cowfish, boxfish, puffers, triggers, filefish, and related species.
UniQuaria
Moderated high-volume all-species freshwater e-mail list.
Yahoo! Groups: Saltwater Fish Tanks
Advice and discussion of the keeping of all saltwater fish both on-list and in chatrooms.