IIKADS Ol IMKE, PICKEREL AM) IIYBKIDS 



Head of adull pike at top. Extent of scale covcritiK on operculum 

 Igill covcrinKl indicated by white line. Head of adult inckcrcl, 

 operculum fully scaled. Head of artificially produced liyl>rHl- A'^ 

 bottom, head of supposed hybrid, captured in CayuRa Lake. White 

 line indicates extent to which scales cover the oijcrculum. (I'lg. 4. a, 

 b, c, d.) 



