For those who like this show I'd recommend another one that's on On Demand PBS right now. It's a nature show called Superfish. Rick Rosenthal goes around the world filming billfish(sailfish, marlin etc) in the water it's absolutely stunning stuff and the story behind it is pretty alarming(he says 90% of the worlds billfish have disappeared in the last 50 years to overfishing by commercial boats).
There's a scene with him off Mexico with at least 100 sailfish swimming around him, a scene where he finds a sailfish nursery and has a baby in his hand that literally fits in his hand. ANother scene with him swimming with a 1000 pound marlin that has 3 male marlin below it looking to mate, and 3 bullsharks below that looking to eat dinner.
It's on DVD too.