Marine Biodiversity Records

First records of small-sized young giant squid Architeuthis dux from the coasts of Kyushu Island and the south-western Sea of Japan

Toshifumi Wadaa1 c1, Tsunemi Kuboderaa2, Morihiko Yamadaa3 and Hiroyoshi Terakadoa4

a1 Institute of Natural and Environmental Sciences, University of Hyogo, Yayoigaoka 6, Sanda, Hyogo 669-1546, Japan

a2 National Museum of Nature and Science, Collection Center, Amakubo 4-1-1, Tsukuba city, Ibaragi 305-0005, Japan

a3 Kagoshima City Aquarium, Honkoshin-machi 3-1, Kagoshima city, Kagoshima 892-0814, Japan

a4 Shimane Prefectural Fisheries Technology Center, Setogashima-cho 25-1, Hamada city, Shimane 697-0051, Japan

Abstract

Three individuals of small, young giant squid Architeuthis dux were caught in or near Japanese coastal waters during April–June 2013. The first occurrence of a young individual of 140.8 mm dorsal mantle length with a total weight of 44.81 g was recorded on the coast off Uchinoura, Kagoshima, Kyushu Island, southern Japan. The remaining two young individuals, both measuring 332.0 mm in dorsal mantle length with total weights of 390.63 and 356.95 g respectively, were caught on the coast off Hamada, Shimane, south-western Sea of Japan. Most morphological traits of all the specimens were consistent with those of A. dux, which was supported by further genetic analysis. Here we present some morphological traits of young giant squids with morphometric data and photographs.

(Received May 13 2015)

(Accepted September 24 2015)

Keywords

  • Architeuthis dux ;
  • small;
  • young;
  • morphological traits;
  • genetic evidence;
  • giant squid;
  • southern Japan

Correspondence

c1 Correspondence should be addressed to: T. Wada, Institute of Natural and Environmental Sciences, University of Hyogo, Yayoigaoka 6, Sanda, Hyogo 669-1546, Japan email: wada@hitohaku.jp