新潟県および京都府の河川で観察・採集されたカマツカの斑紋変異個体

抄録

Marking pattern variants of the pike gudgeon Pseudogobio esocinus are reported from streams in Niigata and Kyoto Prefectures, Japan. The variant specimens have lost most of the body markings observed in normal specimens, i.e., dark blotches and small black spots on the lateral and dorsal sides of the body, and small black spots on the dorsal, pectoral, and caudal fins. In addition, a specimen from Kyoto Prefecture had a narrow black lateral stripe on the body instead of a narrow yellow-gold stripe under dark blotches. Mitochondrial DNA sequence variations seen in the variant specimens from the two streams suggest that they were derived from their respective indigenous populations.