Biomass fluctuation of two dominant lanternfish <Emphasis Type="Italic">Diaphus</Emphasis><Emphasis Type="Italic">garmani</Emphasis> and <Emphasis Type="Italic">D. chrysorhynchus</Emphasis> with environmental changes in the East China Sea |
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Authors: | Seiji Ohshimo Tohya Yasuda Hiroshige Tanaka Chiyuki Sassa |
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Institution: | (1) Seikai National Fisheries Research Institute, FRA, 1551-8 Taira-machi, Nagasaki 851-2213, Japan |
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Abstract: | Acoustic surveys have been conducted for estimating the biomass of commercially important fish (e.g., anchovy, jack mackerel),
lanternfish (Diaphus
garmani and D. chrysorhynchus), and pearlside (Maurolicus japonicus) in summer in the East China Sea (ECS) since 1997. The biomass of lanternfish and pearlside was 2.26–19.16 times that of
commercially important fish, and these species represented substantial biomass in the ECS. Though there were no correlations
between biomass of pearlside and environmental indices, significant correlations between biomass of lanternfish and southern
oscillation index (SOI) in March (positive correlation), arctic oscillation (AO) in March (negative) and October (positive),
monsoon index (MOI) in February (positive), and Kuroshio flow mass in winter (positive) were observed. Weak AO and strong
MOI would cool down the sea temperature and would lead to increased primary and secondary production in the ECS, thereby enhancing
larval survival of lanternfish. The SOI would affect the Kuroshio meander in the ECS, and strong SOI and Kuroshio flow mass
would transport larvae of lanternfish to the present survey area. This is the first report on the lanternfish standing stock
and its fluctuation in the ECS. |
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