Abstract

Carp (average body Length 7.1cm) was experimentally infected with oncomiracidium of Diptozoon nipponicum. The development of diporpae and their pairing were observed followingthe infection for 7 days at 25°C. The 2nd, 3rd and 4th pair of clamps were first confirmed 2, 3, 7days following infection, respectively. The ventral sucker was first observed after 3 days. Pairing of two diporpae occurred after 4 days, as a result of formation of the ventral sucker, an essential organ for pairing. All the paired diporpae had three, less often four, pairs of clamps, indicating that diporpae with 3rd clamp were ready for pairing.

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