長良川産魚類の形態異常と寄生虫感染の経年変化〔英文〕

概要

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Over 28, 000 fishes consisting of seven species collected during the period from 1968 to 1986 in the River Nagaragawa were examined for abnormalities and parasitic infestation. Skeletal anomalies, fin erosion, discoloration and parasitic infestation by a trematode Metagonimus sp. were observed in varying frequencies in different fish species during various years of sampling. Among the fishes examined, Zacco platypus seemed to be more vulnerable to skeletal anomalies manifesting many kinds of abnormalities such as vertebral curvature, shortened 2nd vertebra and bulged fin rays etc. and Tribolodon hakonensis was found to be more susceptible to parasitic infestation. Long-term study on the abnormalities and parasitic infestation exhibited relatively higher prevalence during the late 1960s and early 1970s, but decreasing pattern in the late 1970s and 1980s.
日本水産學會の論文