Freshwater Rays and Channa Snakeheads
Freshwater rays are unique, if only because popular lore is dominated by their saltwater kin. The freshwater variety can be quite large, requiring fish-keepers with larger than normal tanks and special know-how.
Channa (more commonly known as snakesheads) are a predatory fish with a unique shape. Though they are prized in the aquarium trade, some consider them an invasive species. Some were released from aquariums and have shown up in North American streams and lakes. There is fear that they may disrupt the eco-system.
(source:google/http://webecoist.momtastic.com/)
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