| XIONG Ying,ZHONG Xiaming,TANG Jianhua,YANG Jian. 2016. Migration and population structure characteristics of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea. Acta Oceanologica Sinica, 35(6):34－41 |
| Migration and population structure characteristics of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea |
| 黄海南部小黄鱼洄游分布及种群结构特征 |
| Received:February 10, 2015 Revised:December 16, 2015 |
| DOI：10.1007/s13131-016-0844-7 |
| Key words:small yellow croaker resource distribution migration body length sex ratio |
| 中文关键词: 小黄鱼 资源分布 洄游 体长 性比 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XIONG Ying | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214182, China
Jiangsu Marine Fisheries Research Institute, Nantong 226007, China | | | ZHONG Xiaming | Jiangsu Marine Fisheries Research Institute, Nantong 226007, China | | | TANG Jianhua | Jiangsu Marine Fisheries Research Institute, Nantong 226007, China | | | YANG Jian | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214182, China
Key Laboratory of Fishery Ecological Environment Assessment and Resource Conservation in Middle and Lower Reaches of the Yangtze River, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | jiany@ffrc.cn |
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| Abstract: |
| 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 Lüsi 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. |
| 中文摘要: |
| 利用黄海南部2003年和2013年逐月的调查数据,揭示了近10年期间该水域小黄鱼种群的资源分布、生长和性比等生物学特征的变化规律。结果表明,春季小黄鱼从沙外渔场向大沙渔场洄游,4月和5月小黄鱼集中分布在大沙渔场中部和西部;秋季小黄鱼从大沙渔场由西向东洄游至外海越冬场,10月和11月已达大沙渔场中部;冬季进入沙外渔场西部水域。两个年份的秋季外海有大量的幼鱼集群。2013年产卵群体和越冬群体体长均大于2003年,两个年份性比(雌:雄)均显著小于1。根据逐月资源分布规律,黄海南部小黄鱼种群洄游分布与以往"黄海南部种群在济州岛西部越冬场与吕泗产卵场之间洄游"的观点相吻合,但外海出现了小黄鱼的产卵场,且全年的洄游向北移;近10年来小黄鱼体长变化趋势为先降后升,而非持续下降;近10年帆张网中小黄鱼性比表现为上升趋势,但不同网具间性比表现不一致(小于1或大于1),有待于今后深入研究。 |
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