[MIS25-P09] Determine of host-parasitic relationship of freshwater parasites using stable isotope analysis
Therefore we will measure the trophic relationship between parasites and host organisms using stable isotopes to elucidate the trophic level of parasites.
Cyprinid fish collected in Lake Biwa were dissected, and parasites were collected from the oral cavity, gills, swimwear, and digestive tract. The gills, swimwear, digestive tract, and muscle were removed from the host. All samples were lyophilized, powdered and measured. The measurement was performed using EA / IRMS, and Δ13C and Δ15N of the sample were measured. In addition, EA-IRMS was partially modified to measure microparasites one.
Crustaceans, monogenea, trematoda (larvae, adults), and acanthocephalans were found in Opsariichthys uncirostris. Δ13C and δ15N of the collected crustaceans, trematoda and acanthocephalans were measured. All the measured parasites showed negative values in Δ13C and Δ15N. We discuss these results.