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Stock size fluctuations in chub mackerel ( Scomber japonicus ) in the East China Sea and the Japan/East Sea
Author(s) -
Hiyama Yoshiaki,
Yoda Mari,
Ohshimo Seiji
Publication year - 2002
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.1365-2419.2002.00217.x
Subject(s) - scomber , china sea , fishery , oceanography , stock (firearms) , mackerel , catch per unit effort , stock assessment , environmental science , geography , geology , biology , fishing , fish <actinopterygii> , archaeology
The stock size of chub mackerel ( Scomber japonicus ) in the East China Sea and the Japan/East Sea has shown a continuous decrease, with fluctuations, from 1975 to 1990. After a remarkable increase in 1992–96, the stock size fell to its lowest level in 1997–99. The spawning success (number of recruits/spawning biomass) fluctuates periodically with a period of several years, although there are no clear relationships between the spawning biomass and the number of recruits. Spawning success was inversely correlated with sea surface temperature (SST). On the contrary, the catch amount and the catch per unit effort (CPUE) of spotted mackerel ( Scomber australasicus ) has increased since 1997.