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The zooplankton biomass in the Sea of Japan
Author(s) -
Hirota Yuichi,
Hasegawa Seizo
Publication year - 1999
Publication title -
fisheries oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 80
eISSN - 1365-2419
pISSN - 1054-6006
DOI - 10.1046/j.1365-2419.1999.00116.x
Subject(s) - zooplankton , oceanography , spring (device) , biomass (ecology) , submarine pipeline , environmental science , seasonality , climatology , geography , geology , ecology , biology , mechanical engineering , engineering
We examined seasonal, annual variation and horizontal distribution of zooplankton in the Sea of Japan from 1966 to 1990. Zooplankton was most abundant in the spring. The spring maximum appeared in February–March and in April–May in the southern and eastern parts of the study areas, respectively. In the summer and autumn, a secondary peak was most conspicuous in the eastern part. The difference between the estimated biomass at night and day was large in the spring and small in summer and autumn. The biomass in the offshore southern area peaked about every 3 years between 1966 and 1983, and increased abruptly in 1990. The density in the area north of 39°N or 40°N was high. Total biomass estimated in the upper 150 m layer in the Sea of Japan (10 6 km 2 ) was 9.5 × 10 6 t in the daytime and 16.6 × 10 6 t at night.