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Average lifespan of fish vary on multitude of factors. Fish that are kept in a well maintained aquarium and are cared for well can live a life of 5-10 years. Each breed of tank fish can have their own life expectancy, Beta fish also known as siamese fighting fish have an average lifespan of 2 years, while Oscar fish can live much longer than that if kept in optimal condition of 5-10 years.

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12y ago

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