Estimate to find your answer - You HAVE to estimate 1999 & 499 then answer the numbers

1,999 - 499 is about???

He had fished in the river since ten years and he was a good fisherman. he know where to found the slim sliver chilwa fish, a big beautiful mahseer and the long moustache singhara. he know where the river was deep but where it is shallow; he knew which baits to use - which fish like worms and which liked gram. edit the above