ever see a fluke with a brown belly side?

Max Lawless wondered on Facebook
Can someone tell me why this fluke doesn’t have a white belly ? I [have] never seen a fluke like this before…
Read more for the answer…

Sometimes during larval development the flounder will have a mutation occur in coloring known as piebald. Failure for the eye to migrate over because of a skull bone obstruction often causes piebald, which are anomalous colored portions to the body, head or tail. We see these caught several times a year, there is nothing wrong with the fish, just the coloring. It occurs during the larval development when the fish starts to turn to a flatfish from your typical fish shape. Piebald is a natural mutation in nature and is not an indication of environmental conditions.

http://www.delaware-surf-fishing.com/delaware-fish-id/summer-flounder-paralichthys-dentatus/

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