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 |
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Authors: | Email author" target="_blank">Akihiko?YatsuEmail author Chiyuki?Sassa Masatoshi?Moku Takahiro?Kinoshita |
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Institution: | National Research Institute of Fisheries Science, Yokohama, Kanagawa 236-8648,;Seikai National Fisheries Research Institute, Nagasaki, Nagasaki 851-2213,;National Fisheries University, Shimonoseki, Yamaguchi 759-6595 and;Japan Sea National Fisheries Research Institute, Niigata, Niigata 951-8121, Japan |
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Abstract: | ABSTRACT: 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 large-sized (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. |
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Keywords: | anchovy gempylid Kuroshio–Oyashio Transition Zone mackerels midwater trawl myctophids sardine vertical distribution |
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