実験的終宿主,及びその消化管内における嚢虫とProcercusの動態について (養殖ハマチに寄生する嚢虫に関する研究-10,11-)

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From preliminary experiments where bladder worms, plerocercus of Callotetrarhyuchus sp., collected from the body cavity of Seriola quinqueradiata were introduced into the stomach of several species of sharks kept in aquaria, it was found that a kind of requiem shark, Triakis scyllia MÜLLER et HENLE, was suitable for tracing the development of this Trypanorhynchan cestode. Movement and development of the bladder worms introduced orally into the stomach of T. scyllia were observed as follows: 1) In the stomach of T. scyllia the bladder worms escaped from the sorrounding membrane, made of connective tissue of S. quinqueradiata, within 12 hours after administration. 2) The naked bladder worms became very active and moved toward the valvular intestine through the middle intestine by stretching and shrinking their body. 3) At the posterior parts of the valvular intestine or the colon, the scolecis became free from the bladders and immediatly fixed themselves to the walls of the intestine with 4 tentacles. Escaping of the scolecis was completed from 6 to 18 hours after administration. 4) The main site of parasitism was the spiral valve of the terminal of the valvular intestine, though some scolecis moved to the middle part of the valvular intestine within 24 hours after administration. 5) The average infection rate of the bladder worms, determined 24 hours after administration in 2 sharks, was observed to be 65.0%. The anchovy worms, procercus of Callotetrarhynchus sp., (procercus was a new term tentatively given by the present authors to a pre-staged larva of plerocercus), which were collected from Engraulis japonica, were scarcely attacked and penetrated the wall of the gut of T. scyllia. Part of the worms introduced were digested in the stomach and the rest were discharged from the anus within 24 hours after administration.
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