Migration and population structure characteristics of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea
文献类型: 外文期刊
第一作者: Xiong Ying
作者: Xiong Ying;Yang Jian;Xiong Ying;Zhong Xiaming;Tang Jianhua;Yang Jian
作者机构: Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214182, Peoples R China;Jiangsu Marine Fisheries Res Inst, Nantong 226007, Peoples R China;Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Fishery Ecol Environm Assessment & Resour, Wuxi 214081, Peoples R China
关键词: small yellow croaker;resource distribution;migration;body length;sex ratio
期刊名称:ACTA OCEANOLOGICA SINICA ( 2020影响因子:1.431; 五年影响因子:1.445 )
ISSN: 0253-505X
年卷期: 2016 年 35 卷 6 期
收录情况: SCI
摘要: Monthly fishery survey data of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea from 2003 and 2013 were employed to evaluate the variation in the resource distribution and biological characteristics (especially body length and sex ratio) in the population on a decadal scale. The results indicated that the small yellow croaker migrated from the Shawai fishing ground to the Dasha fishing ground in spring and was mainly distributed in the central and western parts of the Dasha fishing ground in April and May. Larimichthys polyactis in the Dasha fishing ground migrated eastward to offshore wintering grounds in autumn and reached the central Dasha fishing ground in October and November. The small yellow croaker entered the western waters of the Shawai fishing ground in winter. A large number of age 0+ fish occurred in the Shawai and Jiangwai fishing grounds in October of 2003 and 2013. The body lengths of the spawning stock and wintering stock in 2013 were larger than those in 2003, and the monthly sex ratios (female to male) were significantly less than 1 in both years. The monthly distribution of this fish in the southern Yellow Sea was consistent with a previous finding that "the stock migrated between the wintering grounds in the west of Jeju Island and the Lusi spawning grounds" but tended to move more northward, with the spawning grounds extending outward. In the past decade, body length variation experienced a decline after an increase, rather than a steady decrease. The sex ratio in the single-stick stow net showed a tendency to increase over the decade, but was either less than or more than 1 depending on the fishing gear; therefore, further studies should be conducted to determine the sex structure.
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