Izunuma-Uchinuma Wetland Researches
Online ISSN : 2424-2101
Print ISSN : 1881-9559
ISSN-L : 1881-9559
Predation on endangered Gomphid dragonfly larvae by nonnative channel catfish
Makoto A. YoshidaYuugo Miyawaki
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2024 Volume 18 Pages 39-51

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Abstract

Larvae of endangered gomphid dragonflies were found in the stomach contents of channel catfish Ictalurus punctatus, an invasive alien species, collected in the lower Yodo River, Osaka Prefecture, Japan in 2020–2023. The following dragonfly species were identified: Stylurus annulatus (25 individuals), S. oculatus (6 individuals), Melligomphus viridicostus (2 individuals), Shaogomphus postocularis, Nihonogomphus viridis, and Sieboldius albardae (1 individual each). One of the channel catfish collected in April 2022 fed on 20 larvae of S. annulatus, which is listed as Vulnerable (VU) in the Red List of Japan. Predation pressure from channel catfish may cause a decline in the population of S. annulatus. Ongoing accumulation of information on the feeding habits of channel catfish will reveal its impact on native aquatic organisms, including threatened insect species.

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© 2024 The Miyagi Prefectural Izunuma-Uchinuma Environmental Foundation
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