And yes, I like the info system better this time.... you get the first section as soon as you click on a new fish, then the second section after feeding it (and I guess some might want petting or using the whistle like last time too)
Oh, and although (so far) you only seem to be able to dive in designated spots (rather than picking exactly where you move the boat to) if you want to get to somewhere fast you can ride the dolphin, which seems to be about double the speed of normal swimming.
Oh, and @ cheebee... there is a kind of achievment system, which gives you a title (like at the start you are a novice diver) I thought as you mentioned you also like Douglas Adams, one of the titles is Hitch Hiker, so that's what I am now (it's not a levelling thing so you can keep or change the title to any that you have unlocked)
(I haven't been online yet, but I would guess the title is shown to your diving buddy)