Even the latest data that came out a year or two ago from the data sets that are collected nationally showed that just about twice as many—a lot more rivers—are still degrading compared with improving, according to the macroinvertebrate index. These are little critters that live under rocks, and if the water's too polluted from sediment or from excessive nutrient, they die. We've got rivers in New Zealand that have lost more than 90 percent of their macroinvertebrates. They're just about functionally dead in respect of those ecosystems, and that affects not just the macroinvertebrates but the eels—the tuna—which are the fish that feed on them, and, again, it's another indicator of problems. 