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Otolith morphology is widely used for fish stock identification. The sulcus, a structure on the medial side of the otolith, is an important feature in morphological analysis. This study was conducted to evaluate the feasibility of using sulcus morphology for stock identification and to compare its performance with commonly used otolith morphology analysis. Otoliths were collected and analyzed from three geographical groups (the Huanghe (Yellow) River estuary, HHE;the Jiaozhou Bay, JZB;and the Changjiang (Yangtze) River estuary, CJE) of yellow drum Nibea albiflora. The results show that the analysis of sulcus morphology based on shape indices (SIs), elliptic Fourier coefficients (EFc), and a combination of the two parameters identified stocks at overall classification rates of 51.0%, 72.5%, and 73.2%, respectively. These classification rates are similar to those obtained using otolith morphology analysis (57.0%, 73.8%, and 76.5% by SIs, EFc, and their combination, respectively). The findings suggest that sulcus morphology is comparable to the commonly used otolith morphology for identifying stocks of sciaenids, such as the yellow drum. For both otolith and sulcus morphology, EFc could identify the stocks more efficiently than SIs, while the combination of SIs and EFc was even better. 相似文献
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青海东昆仑地区是青海省重要的金、铜、铁多金属成矿区,1∶250 000、1∶50 000水系沉积物地球化学测量工作在该区域圈定了众多的异常区,但总体查证程度偏低。为实现该区域找矿重大突破,选定巴隆地区部署开展了以采集水系沉积物为主、残坡积岩屑物质为辅的1∶25 000沟系沉积物地球化学测量工作,取得了较为突出的找矿效果。该项工作表明,在青海省东昆仑地区,1∶25 000沟系沉积物地球化学测量方法是一种有效的地质找矿工作手段。该方法能有效克服东昆仑地区北部水系不发育、风成物干扰严重,南部高山区碎石流发育、影响水系沉积物汇聚等因素对找矿的干扰,相对传统的地质找矿方法在异常查证过程中的适用性、可操作性更强,找矿效果好,能实现矿体的精确定位,对东昆仑的地质找矿工作具有借鉴作用。 相似文献
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