アマゾン東部（ブラジル）の2つの河川のPlagioscion squamosissimus（Osteichthyes: Sciaenidae）のメタゾアン寄生虫

Metazoan parasites of Plagioscion squamosissimus (Osteichthyes: Sciaenidae) of two rivers from the eastern Amazon (Brazil).

• Darlison Chagas de Souza
• Jorge Costa Eiras
• Edson Aparecido Adriano
• Lincoln Lima Corrêa

抄録

本研究の目的は，ブラジル・アマゾン東部の2つの河川において，P. squamosissimusに感染するメタゾアン寄生虫の群集とその生息環境を比較検討することである。本研究の目的は、ブラジル・アマゾン東部の2つの河川において、P. squamosissimusに感染するメタゾアン寄生虫の群集とインフラコミュニティを比較することであった。Lago Grande do CuruáiとTapajós川河口から合計75検体を採取した。形態分析の結果，寄生虫は16種，3種（Myxobolus属，Ceratomyxa属，Henneguya属），2種（Austrodiplostomum compactum，Digenea属（metacercariae）），2種（Diplectanum属，Euryhaliotrema属），2種（Diplectanum属，Euryhaliotrema属）が確認された。Euryhaliotrema sp.），線虫類3種（Procamallanus (S.) sp.，Anisakis sp.，Pseudoproleptus sp. （幼虫），アカント頭皮類2種（Rhadinorhynchus plagioscionis，Neoechinorhynchus sp.），Cestoda Ptychobothriidae gen. sp. 1種，甲殻類3種（Therodamas sp.，Ergasilus sp.，Dolops sp.）。P. squamosissimusの寄生虫は6種が新たに記録されたが，そのうち3種は粘菌類，1種は線虫類，2種は甲殻類であった。両河川の寄生虫の構成群集には違いがあり，それらについて議論した。

Plagioscion squamosissimus, commonly known as "white hake" or "corvina", is among the most commercially important fish in the Amazon and host to a great diversity of endoparasites. The aim of the present study was to compare the communities and infracommunities of metazoan parasites that infect P. squamosissimus in two rivers from the eastern Brazilian Amazon. A total of 75 specimens of P. squamosissimus were collected from Lago Grande do Curuái and the mouth of the Tapajós River. Morphological analysis revealed the presence of 16 parasite species, three myxozoans (Myxobolus sp., Ceratomyxa sp., Henneguya sp.), two trematodes (Austrodiplostomum compactum, Digenea gen. sp. (metacercariae), two monogeneans (Diplectanum sp., Euryhaliotrema sp.), three nematodes (Procamallanus (S.) sp., Anisakis sp., Pseudoproleptus sp. (larva), two acanthocephalans (Rhadinorhynchus plagioscionis and Neoechinorhynchus sp.), one Cestoda Ptychobothriidae gen. sp. and three crustaceans (Therodamas sp., Ergasilus sp., Dolops sp.). Six new records of parasites of P. squamosissimus were made, of which three were myxozoan species, one nematode species and two crustacean species. There were differences in the component communities of parasites of both rivers studied and these were discussed.