TY - JOUR ID - TI - Preliminary Investigations on Coilia nasus from the Kenli Section of the Huanghe River Based on Otolith Microchemistry AU - CONG Xuri AU - LI Xiuqi AU - DONG Guancang AU - WANG Yanan AU - SUN Lufeng AU - KE Han AU - YANG Jian AU - JIANG Tao VL - 43 IS - 1 PB - 中国水产科学研究院黄海水产研究所 SP - 31 EP - 37 PY - JF - 渔业科学进展en JA - UR - http://journal.yykxjz.cn/yykxjzen/ch/reader/view_abstract.aspx?file_no=20200424004&flag=1 KW - 黄河垦利段;刀鲚;耳石;电子探针微区分析技术 KW - Kenli section; Coilia nasus; Otolith; Electron probe microanalyzer AB - Life histories for Coilia nasus in the Kenli section of the Huanghe River were reconstructed using otolith microchemistry. An electron probe microanalyzer (EPMA) was used to analyze the Sr and Ca microchemistry patterns in otoliths of five C. nasus individuals(D1,D2,D4,D5 and D6 collected from Kenli section in May 2016. Results of line transect analysis showed that the life history of C. nasus was complex. All individuals were born in fresh water with a lower Sr/Ca ratio in the core area; however, as they grew, they demonstrated different life histories. After leaving the freshwater habitats, D1 and D4 mainly lived in the estuarine environment rather than seawater, where the salinity is relatively lower; the maximum Sr/Ca ratios of D1 and D4 were 6.1 and 6.2 respectively. D2 moved between the freshwater and brackish water habitats without migrating. The Sr/Ca ratios of D5 and D6 were higher, manifesting the maximum Sr/Ca ratios of 8.44 and 8.63, respectively. However, because of water and sediment discharge regulations, we cannot judge whether the habitat of D5 and D6 had been extended to the sea. All differences were confirmed from the mapping results of the EPMA data. The otolith of D1 and D4 presented a bluish pattern in the core area and greenish pattern in the outer regions. The otolith of D2 showed a multicolored pattern (alternating bluish, greenish, even yellowish). The otolith of D5 and D6 presented a bluish pattern with lower Sr/Ca ratios in the core area; as they grew, a yellowish circle was formed in outer regions adjacent to the bluish central regions. Based on the results, we were able to reconstruct the habitat history of C. nasus in the Kenli section of the Huanghe River. Most of the individuals completed their hatching and early life mainly in freshwater habitat, then entered the estuary or seawater, and leaved to and from the fresh-brackish water habitats for feeding until they were captured. The life history of the freshwater stock represented by D2 is relatively complex, and we speculate that it may enter the Huanghe River because of the water drainage during the flood season in Dongping Lake. ER -