- 水生動物 (ISSN:24348643)
- vol.AA2019, pp.AA2019-10, 2019 (Released:2019-10-13)
We investigated genetic population structure and tetrodotoxin (TTX) content of yellowfin toxic goby Yongeichthys criniger in the Japanese coastal area. Two divergent mitochondrial lineages (lineages A and B) were found, and the frequencies were clearly different among Okinawa-Iriomote Island, Amami Oshima Island and northward of Yakushima Island. Genetic heterogeneity among three groups were supported by principal coordinate analysis based on the pairwise FST values. TTX contents were measured in goby samples from Kochi Prefecture (Kashiratsudoi River) and Yakushima Island (Isso Port and Anbo River). TTX contents of skin and muscle tissues of Kashiratsudoi River and Isso Port samples were relatively high, while TTX was not detected in most individuals collected in the Anbo River. Therefore, it is suggested that the TTX contents of this species considerably vary even among geographically close areas and/or seasonally.