Plankton and Benthos Research
Online ISSN : 1882-627X
Print ISSN : 1880-8247
ISSN-L : 1880-8247
Original Papers
Piscivory of the Japanese giant box jellyfish Morbakka virulenta
Yusuke KondoShoma OkadaSusumu OhtsukaTakeshi HirabayashiAya AdachiMakoto UrataSho ToshinoHiroshi MiyakeNanako O. OgawaNaohiko Ohkouchi
ジャーナル フリー

2018 年 13 巻 2 号 p. 66-74


In this study, we investigated the trophic interactions between the Japanese giant box jellyfish, Morbakka virulenta, and fish in the central part of the Seto Inland Sea, western Japan, in autumn and winter. Occurring in the surface waters at nighttime, these cubomedusae, regardless of their size (1.5 to 22.5 cm in bell height), were found to be piscivorous, feeding mainly on the Japanese anchovy, as shown by their stomach contents analysis. This finding was supported by a stable isotopic analysis and by an unchanged cnidome, irrespective of the bell height of medusae. Their nocturnal occurrence near the surface often took place around the slack tide, during which the medusae were foraging with tentacles fully extended. Other associations between the medusae and fish were also observed at this time: presumed commensalism with juvenile Japanese horse mackerel, and predation by black scraper.

© 2018 The Plankton Society of Japan
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