The East China Sea (ECS) off the Coast of Zhoushan Archipelago, Zhejiang (ECS-CZA) is home to abundant fishery resources and an important spawning, feeding, and nursing ground for a variety of fish species. Due to long-term overfishing, the ichthyoplankton structure has been dramatically altered. Understanding the species composition and distribution of fish eggs and larvae is one of the most essential tasks to accurately regulate fishery resources and formulate effective management policies; however, little is known about the ichthyoplankton in this region. In this study, an integrated strategy of morphology identification (MI) and mitochondrial COI DNA barcoding were used to identify species of fish eggs and larvae collected from the ECS-CZA. MI revealed 15 fish egg species belonging to 12 families and 12 fish larva species belonging to 12 families; in contrast, DNA barcoding altogether identified 30 species, including 18 fish egg species and 13 fish larva species. One species was shared between the egg and larva samples. Our study offers useful tools and critical scientific information for understanding the recruitment, distribution, and conservation management of various fish species in this marine environment.
As the main facility for offshore oil and gas development, floating production storage and offloading (FPSO) has received great attention from researchers and engineers. This paper relies on a time-domain analysis code to investigate the effects of mooring line hydrodynamic coefficients and wave parameters on the FPSO motions. In order to verify the reliability of this code, the hydrodynamic software AQWA is used for comparison. Under the irregular wave, it can be found that the results calculated by these two numerical tools are in good agreement. After that, two cases concerning the hydrodynamic coefficients and wave parameters are created. Finally, the sensitivity of the FPSO motions to mooring line hydrodynamic coefficients and wave parameters are discussed. The results show that the mooring line hydrodynamic coefficients and wave parameters have a significant influence on the FPSO dynamic behavior. However, among the results, it can be found that the wave-frequency motions are not affected by the hydrodynamic coefficients of the mooring line due to the turret-moored configuration. In general, they are of great help for the initial design of the FPSO system.
随着航运业的迅速发展,船舶大气污染物排放越趋严重,造成的环境问题引起了国际航运前沿动态社会的广泛重视.为研究港区集装箱船舶节能减排措施的效果,文章以宁波舟山港为例,首先分析影响港区集装箱船舶减排的影响因素,确定经济,能源、环境、船舶以及政策5个系统要素及之间的相互关系,并借助因果关系图展示予以研究,再构建港区集装箱船舶减排的系统动力学流图,拟定减排方案,动态仿真出不同减排方案下的实施效果并进行对比分析.
矢耳石作为重要的硬组织,被广泛用于鱼类的生长、种群结构和生活史等研究.根据2020年10月—2021年10月东海海域采集的331尾带鱼样本,测量了 15个矢耳石形态特征参数,通过主成分分析、Pearson相关分析、独立样本t检验、方差分析和最小显著差异法对矢耳石形态特征与生长进行了研究.结果表明,东海海域带鱼矢耳石呈长梭形,基叶、翼叶区分明显;其矢耳石的主要形态特征参数为基叶到翼叶的长度(DRA)、基叶到矩口的长度(DRI)、基叶到后端的长度(DRP)、翼叶到后端的长度(DAP)和矩口到后端的长度(DIP);其矢耳石的生长受性别、体型大小和性腺发育等因素影响.东海海域带鱼矢耳石特征参数及其生长影响因素的确定,为后续利用矢耳石研究东海海域带鱼渔业生态学及资源评估提供了科学依据.
为了探究冷冻赤道鱿鱼品质受解冻方法的影响,采用4种解冻方法—冷藏解冻、空气解冻、流水解冻和盐水解冻.分别解冻赤道鱿鱼后,通过测定肌肉持水性等物理特性和肌原纤维蛋白相关化学指标.结果表明:赤道鱿鱼在冷藏解冻组和盐水解冻组肌肉组织破坏程度较小,持水性较高;冷藏解冻羰基含量最低,盐水解冻钙离子酶活性最高,盐水解冻巯基含量较高.综合鱿鱼各项测定指标,最合适的解冻方法是盐水解冻和冷藏解冻.
