I found a website called http://www.earth-touch.com that has a bunch of short 3-5min high quality wildlife clips and there are about 20 on freshwater fish, I have not seen them all but I have seen two that were from Lake Malawi and they are well done. If you stream it is low quality but if you scroll down you can download a HD 720p version that looks great. Just thought I would share since its hard to find documentaries of freshwater fish. Well, I'm off to watch some more.