Is that this mod's doing? I can't be sure but none of the other mods that I updated today have anything to do with landfill or fishes, and since this mod said that one of the changes was that you can't place tiles over roads, and there are fishes on roads... yeah, I know... long shot, but, I don't know :/
The new road type is awesome btw, but the landfill change is too disruptive... you have to deconstruct all the fishes in an area before placing landfill and even then when marked for decon you can't still place the landfill over them.
If that wasn't this mod's doing, then forget that I said anything... I'll try to track it down and see if I can pinpoint the mod that's causing it.