For starters you may have seen the intro which contains scenes from all 3 videos.
http://media.putfile.com/shark-aquarium
First off, I gotta say they are quite pricey at $130 for 3 DVD's.
Basically they consist of some expeditions in Venezuela where they are collecting fish.
On the wolf fish DVD they collect Aimaras and show underwater footage of mals and golds. If you watched the intro and see the wolf fish try and swallow the other one, that was just nuts. They caught a wolf fish they couldn't really identify. This thing was wicked nasty. I've never seen more aggression from any fish ever. It attacked a net like nobodys business. They thought it might have been a mala so they decided to put a mala in the tank with it to compare them. Bad move. That fish was a true psycho. It was collected in the paragua river.
They also netted an 80 cm (31.5in) Aimara. A friggin monster. They also showed an Aimara in a Venezuelan aquarium during feeding time, eating a cichlid.
The piranha video showed them swimming with caribe and hand feeding them right in the river. They fished some huge caribe and irritans.
And the last DVD was on the Morichal Largo River. Pretty much more of the same. Underwater footage filming various cichlids. Apistogramma Gutta, Cichlasoma Bimaculatum, Copella, Crenicichia and others.
All in all pretty interesting to watch. You kinda get a feel of where your fish come from and get to see how they live in nature. As I stated earlier a bit pricey but I would give the vids 7 outta 10.