According to this question freshwater fish should not be used in Ceviche--why not?
You should never eat freshwater fish in raw preparations. Freshwater fish are far more likely to have nasty parasites such as the lung fluke, that can only be killed by cooking. There is a slew of other nasty beasts that can be harmful if not killed.
Unless you want to end up on an episode of Monsters Inside Me, stay away.
In addition to hobodaves fine answer, freshwater fish usually contains a lot more mercury and other very unhelathy substances caused by human pollution. Some doctors recommend you to only eat freshwater fish twice a month.
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