This is how Fissure's fluke looked in 1986
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And the picture below is how his fluke looked in 1987
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The large patterns have remained the same. In 1986 his fluke had an orange tinge to it, probably from small diatoms clinging to his skin. He had gotten rid of them by the next year, but picked up what look like periwinkles. Enough had stayed the same so we knew it was the same whale.