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Using back projection might work.

The basic idea is to transfer the reference fish image from rgb to HSV Calculate the HS 2D histogram of the reference fish image. Turn the histogram into a probability by normalizing it's sum to 1 Convert the query image into HSV as well For each pixel in query image find it's appropriate bin in the HS histogram. For each pixel create an image of the probabilities taken from histogram.

Here is a good explanation