BCPP Workshop for Freshwater Fishes of India for list of freshwater fishes, their status
Fishbase- a database of very useful information on fishes, their biology, ecology and distribution!
Estimate S - free software for statistical estimation of species richness and shared species from samples.
Ecosim - free software for species diversity, Niche overlap, etc.
Ordination page - a very useful resource for ordination methods
Early Classics in Biogeography, Distribution and Diversity Studies
Systematics of Southeast and East Asian Bagridae and related catfishes