Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan

Abstract A novel species of the family Alepocephalidae (slickheads), Narcetes shonanmaruae, is described based on four specimens collected at depths greater than 2171 m in Suruga Bay, Japan. Compared to other alepocephalids, this species is colossal (reaching ca. 140 cm in total length and 25 kg in...

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Autores principales:	Yoshihiro Fujiwara, Masaru Kawato, Jan Yde Poulsen, Hitoshi Ida, Yoshito Chikaraishi, Naohiko Ohkouchi, Kazumasa Oguri, Shinpei Gotoh, Genki Ozawa, Sho Tanaka, Masaki Miya, Tetsuya Sado, Katsunori Kimoto, Takashi Toyofuku, Shinji Tsuchida
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/225ba43f6d3747bb9dcf7db4d731ddb5
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spelling	oai:doaj.org-article:225ba43f6d3747bb9dcf7db4d731ddb52021-12-02T10:48:21ZDiscovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan10.1038/s41598-020-80203-62045-2322https://doaj.org/article/225ba43f6d3747bb9dcf7db4d731ddb52021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80203-6https://doaj.org/toc/2045-2322Abstract A novel species of the family Alepocephalidae (slickheads), Narcetes shonanmaruae, is described based on four specimens collected at depths greater than 2171 m in Suruga Bay, Japan. Compared to other alepocephalids, this species is colossal (reaching ca. 140 cm in total length and 25 kg in body weight) and possesses a unique combination of morphological characters comprising anal fin entirely behind the dorsal fin, multiserial teeth on jaws, more scale rows than congeners, precaudal vertebrae less than 30, seven branchiostegal rays, two epurals, and head smaller than those of relatives. Mitogenomic analyses also support the novelty of this large deep-sea slickhead. Although most slickheads are benthopelagic or mesopelagic feeders of gelatinous zooplankton, behavioural observations and dietary analyses indicate that the new species is piscivorous. In addition, a stable nitrogen isotope analysis of specific amino acids showed that N. shonanmaruae occupies one of the highest trophic positions reported from marine environments to date. Video footage recorded using a baited camera deployed at a depth of 2572 m in Suruga Bay revealed the active swimming behaviour of this slickhead. The scavenging ability and broad gape of N. shonanmaruae might be correlated with its colossal body size and relatively high trophic position.Yoshihiro FujiwaraMasaru KawatoJan Yde PoulsenHitoshi IdaYoshito ChikaraishiNaohiko OhkouchiKazumasa OguriShinpei GotohGenki OzawaSho TanakaMasaki MiyaTetsuya SadoKatsunori KimotoTakashi ToyofukuShinji TsuchidaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yoshihiro Fujiwara Masaru Kawato Jan Yde Poulsen Hitoshi Ida Yoshito Chikaraishi Naohiko Ohkouchi Kazumasa Oguri Shinpei Gotoh Genki Ozawa Sho Tanaka Masaki Miya Tetsuya Sado Katsunori Kimoto Takashi Toyofuku Shinji Tsuchida Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
description	Abstract A novel species of the family Alepocephalidae (slickheads), Narcetes shonanmaruae, is described based on four specimens collected at depths greater than 2171 m in Suruga Bay, Japan. Compared to other alepocephalids, this species is colossal (reaching ca. 140 cm in total length and 25 kg in body weight) and possesses a unique combination of morphological characters comprising anal fin entirely behind the dorsal fin, multiserial teeth on jaws, more scale rows than congeners, precaudal vertebrae less than 30, seven branchiostegal rays, two epurals, and head smaller than those of relatives. Mitogenomic analyses also support the novelty of this large deep-sea slickhead. Although most slickheads are benthopelagic or mesopelagic feeders of gelatinous zooplankton, behavioural observations and dietary analyses indicate that the new species is piscivorous. In addition, a stable nitrogen isotope analysis of specific amino acids showed that N. shonanmaruae occupies one of the highest trophic positions reported from marine environments to date. Video footage recorded using a baited camera deployed at a depth of 2572 m in Suruga Bay revealed the active swimming behaviour of this slickhead. The scavenging ability and broad gape of N. shonanmaruae might be correlated with its colossal body size and relatively high trophic position.
format	article
author	Yoshihiro Fujiwara Masaru Kawato Jan Yde Poulsen Hitoshi Ida Yoshito Chikaraishi Naohiko Ohkouchi Kazumasa Oguri Shinpei Gotoh Genki Ozawa Sho Tanaka Masaki Miya Tetsuya Sado Katsunori Kimoto Takashi Toyofuku Shinji Tsuchida
author_facet	Yoshihiro Fujiwara Masaru Kawato Jan Yde Poulsen Hitoshi Ida Yoshito Chikaraishi Naohiko Ohkouchi Kazumasa Oguri Shinpei Gotoh Genki Ozawa Sho Tanaka Masaki Miya Tetsuya Sado Katsunori Kimoto Takashi Toyofuku Shinji Tsuchida
author_sort	Yoshihiro Fujiwara
title	Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
title_short	Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
title_full	Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
title_fullStr	Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
title_full_unstemmed	Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan
title_sort	discovery of a colossal slickhead (alepocephaliformes: alepocephalidae): an active-swimming top predator in the deep waters of suruga bay, japan
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/225ba43f6d3747bb9dcf7db4d731ddb5
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Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan

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