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Hepsetus odoe can grow to nearly 2 feet in the wild but captive specimins seldom seem to grow bigger than 10". They are VERY aggressive and will attack and most likely kill any similar looking fish, their large serated teeth are perfect for dismantling any fish that is unfortunate enough to be on the recieving end of a angry pike, keep them singularly or in groups of 5 or more, less and they will kill each other, catfish and non classic fish shaped oddballs are usually ok as tankmates.
They are easier to feed than most of the "pike/baracuda" type Characins and will usually accept dead food from the start, but they are still quite nervous and will crash around the tank if startled so a tank of at least 5x2x2 (150g) is needed for adults and prefferably bigger.