養殖ウナギの鰓に寄生するPseudodactylogyrus microrchis(単生目)-2-産卵,孵化及び宿主上での発育

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The influence of water temperature on oviposition, hatching and development of P. microrchis were studied. The results obtained are as follows: 1) The average number of eggs laid by an individual parasite per day was 1.2 at 10°C, 9.6 (4.9-19.0) at 20°C and 7.7 (3.0-9.8) at 28°C, respectively. 2) The oncomiracidium of the species hatched out mostly in 5-8 days at 20°C and 2-5 days at 28-30°C, but did not hatch out at 10°C in the experimental period of 40 days. 3) A Pseudodactylogyrus-itee eel (A. anguilla) was brought into contact with the swimming oncomiracidia in a small aquarium, and sequential observations of the young forms attaching to the host were made at 28°C. As a result, the young stages could be divided into 5. Stage 1 (0-1 day after attachment to the host): the shape and the size of the anchor were almost the same as those of the swimming larva (oncomiracidium). Stage 2 (1-2 days): the anchor developed in size. Stage 3 (2-3 days): the bar of the anchor appeared. Stage 4 (3-4 days): the ventral and the dorsal processes of the anchor appeared. Stage 5 (4-6 days): the reflexed part of the ventral process was formed. In 6-7 days after attaching to the host, the worm becamé adult morphologically, and actually laid eggs.
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