Hyperpigmentation of common dab (Limanda limanda L.)

Hyperpigmentation primarily affects common dab (Limanda limanda L.) from the North Sea and, less frequently, from adjacent waters such as the English Channel, the Celtic Sea and the Irish Sea. Hyperpigmentation has been recorded in dab since the onset systematic  fish  disease  surveys  in  the  North  Sea  in  the  1980s  and  has  also been observed  occasionally  in  other  flatfish  species  from  the  same  habitat,  such  as  long  rough  dab  (Hippoglossoides  platessoides),  lemon  sole (Microstomus  kitt),  solenette (Buglossidium  luteum)  and  European  flounder  (Platichthys  flesus),  but  at apparently lower prevalence (Grütjen et al., 2013).