How many breeds (or species) of catfish are there?
A breed can mean something other than being the same meaning as species but, for the purpose of answering this question, lets just talk about how many species there are. There are well over 2000 catfish species known to science and counting! In all likelihood there are at least 3000 species of catfish in the world today and some estimates put that at closer to 5000. Many are not described to science and do not have formal names yet still find their way into home aquaria.