Most lakes are freshwater, but there are some that are saltwater. The Great Salt Lake and the Dead Sea are saltwater.
They have fresh waters
All of the Great Lakes are fresh water.
They are usually freshwater
Lakes and rivers are generally freshwater, although there are a few saltwater lakes in existence. The most famous of these include the Great Salt Lake in Utah, and the Dead Sea between Israel and Jordan.
Not saltwater fish, but some freshwater animals/fish.
Most lakes contain freshwater. From this fact, I'm assuming it is made out of freshwater, rather than saltwater.
Lake Superior is the largest of the Great Lakes. It's also the largest freshwater lake in the world. (The Caspian Sea is a saltwater lake.)
Actually, rivers and lakes can have freshwater or saltwater.