Fisheries Science

, Volume 71, Issue 6, pp 1280–1286 | Cite as

Night-time vertical distribution and abundance of small epipelagic and mesopelagic fishes in the upper 100 m layer of the Kuroshio-Oyashio Transition Zone in Spring

  • Akihiko YatsuEmail author
  • Chiyuki Sassa
  • Masatoshi Moku
  • Takahiro Kinoshita


In order to simultaneously compare vertical distributions of small pelagic fishes and mesopelagic fishes during the night in the upper 100 m, one oblique and 11 horizontal tows of largesized (opening area 480 m2) trawl operations were conducted at different depths in the Kuroshio-Oyashio Transition Zone during 20–22 May 1995. While Japanese sardine Sardinops melanostictus and Japanese anchovy Engraulis japonicus were concentrated in the upper 20 m, mackerels Scomber spp. were collected uniformly in the upper 80 m layer. Myctophid fishes Ceratoscopelus warmingii, Diaphus kuroshio, Diogenichthys atlanticus, Myctophum asperum, Notoscopelus spp. mostly N. resplendens, and Symbolophorus californiensis, a gempylid Nealotus tripes, a microstomatid Lipolagus ochotensis and a phosichthyid Vinciguerria nimbaria were dominant components of mesopelagic fishes that ascended to the upper 100 m layer at night, where these mesopelagic fishes concentrated at depths of 20–80 m. In the upper 20 m layer, Japanese anchovy comprised 60% of the total wet weight of all fishes followed by D. atlanticus (3%). C. warmingii (2%) and S. californiensis (2%). Juvenile myctophids were dominant in the upper 20 m layer compared to deeper layers.

Key Words

anchovy gempylid Kuroshio-Oyashio Transition Zone mackerels midwater trawl myctophids sardine vertical distribution 


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Copyright information

© The Japanese Society of Fisheries Science 2005

Authors and Affiliations

  • Akihiko Yatsu
    • 1
    Email author
  • Chiyuki Sassa
    • 2
  • Masatoshi Moku
    • 3
  • Takahiro Kinoshita
    • 4
  1. 1.National Research Institute of Fisheries ScienceYokohama, KanagawaJapan
  2. 2.Seikai National Fisheries Research InstituteNagasaki, NagasakiJapan
  3. 3.National Fisheries UniversityShimonoseki, YamaguchiJapan
  4. 4.Japan Sea National Fisheries Research InstituteNiigata, NiigataJapan

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