As much as I love the variety of mods coming out every week for this game I always notice that nobody seems fond of the sea. I've seen a couple of mods over the years, however they don't seem to do much. I remember in Morrowind there was a massive ocean mod that included sailing, fishing, navigation, finding sunken caves and temples, underwater crypts... as well as a wonderful variety of peaceful and killer fish!
The closest I can find for Oblivion is a mod that makes Slaughterfish more varied sizes. Why is this?