The present state of imposex in several edible whelks in three coasts along Hokkaido, Japan
2006
Fujinaga, K.(Dohto Univ., Monbetsu, Hokkaido (Japan). Faculty of Social Welfare) | Ilano, A.S. | Hayakari, C. | Oyama, Y. | Matsuishi, T. | Nakao, S.
The present state of imposex in several whelks used for consumption from three localities along the coast of Hokkaido, Japan was examined based on RPSI, imposex frequency, and sex ratio. The extent of imposex was compared between species in shallow waters and deep waters. In whelks in shallow waters, imposex was observed, with low RPSI values. However, for whelks in deep waters, there is no need to put imposex in question in all localities. Imposex was not found at all among whelks, or if any, only very few whelks with very slight imposex were observed. From this fact, it is considered that whelks in deep waters are less subjected to the influence of TBT, or that at present the whelk populations have recovered from imposex, even though they had been affected by the use of TBT compounds.
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