I have 10 koi ,2 schabuncken, and a cat fish in my pond . Last spring 3 black fish about 2 inches?

... long showed up in my pond , they dont have any koi resemblance at all . They are now 6 inches ,still black ,from above they are much thinner than

... long showed up in my pond , they don't have any koi resemblance at all . They are now 6 inches ,still black ,from above they are much thinner than koi ,they have fins and tails like a normal gold fish . Are these stow aways from some one putting them in my pond .or the young of my fish

or:... long showed up in my pond , they don't have any koi resemblance at all . They are now 6 inches ,still black ,from above they are much thinner than koi ,they have fins and tails like a normal gold fish . Are these stow aways from some one putting them in my pond .or the young of my fish

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