Imposex Incidence, Morphological and Histological Description of Gonad in Canarium urceus urceus Linnaeus, 1758 (Mollusca: Gastropoda) in Caraga Region, Philippines

The occurrence of imposex was detected in Canarium urceus urceus in Nasipit, Agusan del Norte, Caraga, Philippines. The imposex indices registered the Incidence of Imposex (IOI), Conversion of Potential Female Index (CPFI) and Relative Penis Length Index (RPLI) of 36%, 27%, and 30% respectively. The morphology of gonad of males was characterized by bright orange-red and whitish spot. A female gonad has a completely yellow in color. Imposex female’s gonads has yellow or a mix of yellow and pale orange. The result of the histological analysis revealed that the male gonads were in the active and ripe stages. Out of the samples subjected for histological analysis, 70% undergo the ripe maturity stage and the rest of the samples were active. The female gonads were 80% active and the rest of the samples were ripe. For the imposex gastropods, 100% of the histological samples have the presence of ovarian spermatogenesis. It is recommended to conduct an analysis of Tributyltin (TBT) in the tissue of the gastropods and even on sediments