The number of fish, $f$, in Skipper's Pond at the beginning of each year can be modeled by the equation $f(x)=3(2^x)$, where $x$ represents the number of years after the beginning of the year 2000. For example, $x=1$ represents the beginning of the year 2000, $x=1$ represents the beginning of the year 2001, and so forth. According to the model, how many fish were in Skipper's Pond at the beginning of the year 2006?

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The beginning of year 2006 corresponds to $x=6$.

$$f(6)=3(2^6)$$ $$f(6)=3(64)$$ $$= \boxed{192}$$