Someone should look into bring the Slappy McCracken's Aquatic Life Expanded mod back to life. It hasn't been updated in a long time and I haven't seen or heard anything from the mod creator. It's just a damn shame to let such a good mod like this go to waste.
We didn't really get much attention the first time around and DJ got it in her head to redo most of the models while I need to do a full rewrite of the code for about half our stuff (it's kind of a mess and at this point it'd be easier to rewrite than fix/update/upgrade all the static entities and many of the fish). DJ's been too busy with work (and not motivated enough) to do the models so I haven't bothered with code and the last working version of the mod was for 1.4. It may come back at some point but I have my eye on other programming projects, unless DJ decides she's ready for the model and texture work there's little point at the moment.
Truth be told I got tired of trying to keep up with the MC releases, so it'll likely be some time after the mod API drops when we do get around to it. Sorry for the delayed response, I haven't been on MC Forums in a while since I don't play Minecraft.