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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第72巻 第1号 >

Morphological intraspecific variation of a softnose skate, Bathyraja diplotaenia (Ishiyama, 1952) (Rajiformes : Arhynchobatidae)

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Please use this identifier to cite or link to this item:https://doi.org/10.14943/bull.fish.72.1.9

Title: Morphological intraspecific variation of a softnose skate, Bathyraja diplotaenia (Ishiyama, 1952) (Rajiformes : Arhynchobatidae)
Authors: Nakamura, Kenta Browse this author
Kawai, Toshio Browse this author →KAKEN DB
Keywords: Body color
Placoid scales
Alar thorn patch
Clasper
Maturity
T/S Oshoro-maru
T/S Hokusei-maru
Issue Date: 22-Aug-2022
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 72
Issue: 1
Start Page: 9
End Page: 16
Abstract: The softnose skate, Bathyraja diplotaenia (Ishiyama, 1952) (Rajiformes : Arhynchobatidae), was morphologically examined and described on the basis of 48 male (179.4-856 mm total length) and 45 female specimens (172.8-849 mm total length) to describe intraspecific variation with growth and distribution of placoid scales, alar thorn patch, and body color of the species. The results make clear that placoid scales on the dorsal side of the disc mostly disappear in specimens of 439.3-473.2 mm total length, the alar thorn patch appears in male specimens of 665-751 mm total length, and the body color changes in specimens of 363.6-653 mm total length. In addition, it reveals that the species starts to mature at about 500 mm total length and matures at about 750 mm total length based on growth of clasper length and presence of the alar thorn patch.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/86614
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第72巻 第1号

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