Japanese eel(Anguilla japonica)and chub mackerel(Scomber japonicus)are commercially valuable species in Asian aquaculture.The reduction in eel and chub mackerel resources has been a serious problem in recent years tha...Japanese eel(Anguilla japonica)and chub mackerel(Scomber japonicus)are commercially valuable species in Asian aquaculture.The reduction in eel and chub mackerel resources has been a serious problem in recent years that should be addressed by reducing the catch of their natural populations to halt their decline and reach the Sustainable Development Goals.Furthermore,securing sufficient food supply by aquaculture is an important step in addressing the increasing demand for fish products in recent years.Traditionally,juveniles of the Japanese eel and chub mackerel have been captured to be raised in aquaculture.Owing to the extensive research on these species,new technologies have been developed for full-lifecycle aquaculture of Japanese eel in 2011 and chub mackerel in 2014.These technologies are expected to stop the decline of natural resources and provide a stable food supply.Recently,seed production of these species has increased owing to the development of successful broodstock management and larval rearing techniques.Fundamental information on oocyte maturation and ovulation and its application for artificial induction of sexual maturation is needed to produce good quality seeds of the Japanese eel and chub mackerel.Here,hormonal mechanisms and previously and newly developed methods for artificial seed production have been described.展开更多
为提高东、黄海鲐鱼渔场预报准确率、降低渔业生产成本,研究提出了一种基于提升回归树的渔场预报模型。研究采用2003—2010年我国大型灯光围网渔捞日志数据,以有网次记录的小渔区为渔场,以渔捞日志未记录的区域作为背景场随机选择假定...为提高东、黄海鲐鱼渔场预报准确率、降低渔业生产成本,研究提出了一种基于提升回归树的渔场预报模型。研究采用2003—2010年我国大型灯光围网渔捞日志数据,以有网次记录的小渔区为渔场,以渔捞日志未记录的区域作为背景场随机选择假定非渔场数据,以海表水温等环境因子作为预测变量构建东、黄海鲐鱼渔场预报模型并以2011年的实际作业记录对预报模型进行精度验证。验证计算得到预报模型的AUC(area under receiver operating curve)值为0.897,表明模型的预报精度较高。模型的空间预测结果表明,预报渔场与实际作业位置基本吻合,其位置移动也与实际情况相符。这表明基于提升回归树的渔场预报模型可以用来进行东、黄海鲐鱼渔场的预报。展开更多
文摘Japanese eel(Anguilla japonica)and chub mackerel(Scomber japonicus)are commercially valuable species in Asian aquaculture.The reduction in eel and chub mackerel resources has been a serious problem in recent years that should be addressed by reducing the catch of their natural populations to halt their decline and reach the Sustainable Development Goals.Furthermore,securing sufficient food supply by aquaculture is an important step in addressing the increasing demand for fish products in recent years.Traditionally,juveniles of the Japanese eel and chub mackerel have been captured to be raised in aquaculture.Owing to the extensive research on these species,new technologies have been developed for full-lifecycle aquaculture of Japanese eel in 2011 and chub mackerel in 2014.These technologies are expected to stop the decline of natural resources and provide a stable food supply.Recently,seed production of these species has increased owing to the development of successful broodstock management and larval rearing techniques.Fundamental information on oocyte maturation and ovulation and its application for artificial induction of sexual maturation is needed to produce good quality seeds of the Japanese eel and chub mackerel.Here,hormonal mechanisms and previously and newly developed methods for artificial seed production have been described.
文摘为提高东、黄海鲐鱼渔场预报准确率、降低渔业生产成本,研究提出了一种基于提升回归树的渔场预报模型。研究采用2003—2010年我国大型灯光围网渔捞日志数据,以有网次记录的小渔区为渔场,以渔捞日志未记录的区域作为背景场随机选择假定非渔场数据,以海表水温等环境因子作为预测变量构建东、黄海鲐鱼渔场预报模型并以2011年的实际作业记录对预报模型进行精度验证。验证计算得到预报模型的AUC(area under receiver operating curve)值为0.897,表明模型的预报精度较高。模型的空间预测结果表明,预报渔场与实际作业位置基本吻合,其位置移动也与实际情况相符。这表明基于提升回归树的渔场预报模型可以用来进行东、黄海鲐鱼渔场的预报。
