Anyone else remember the Maxis game El-Fish? I did a review of it for Computer Gaming World back in the early 90's. Here's a Wikipedia entry for it:
http://en.wikipedia.org/wiki/El-FishI would like to have a genetic tree that you can navigate back more than two generations. A way to track which of the breeds you've discovered ala GBA Pokemon would be nice. This would be a grid that would fill in as you discovered fish. Then you could click on a graphic to read more specifics about that fish. Another thing that is sorely needed is a way to store eggs of specific breeds. This would compensate for the lack of fish tanks. And the topper of all toppers would be the ability to layout your own tanks with purchased or created decorative items. I don't like having to go with a fixed tank design. I love the game, eveyrone in the house is playing right now, just would like to see some of these improvements. I would think the highest on this list is the tracking of breeds somehow.