by-catch造句

• There are over 370 species of sharks worldwide . fishery by - catch is the major threat to this species
  全球有超过370种鲨鱼，面对的致命威胁主要是成为渔民捕鱼时的间接渔获。
• There are concerns that harvesting wild shrimp for aquaculture may deplete local shrimp populations or cause by - catch problems , hi addition , the use of wild shrimp poses a serious risk to the shrimp aquaculture industry because they may be carriers of virulent viruses . the life cycle of chinese shrimp has been closed , paving the way for the establishment of genetic improvement programs . the use of dna markers can contribute significantly to the development and implementation of genetic improvement programs
  本文尝试利用aflp及其相关技术sampl在中国对虾中筛选相关分子标记，并通过比较抗病中国对虾(第四代抗病虾)及对照(前几代抗病中国对虾、野生中国对虾)谱带差异，试图找到与中国对虾生长速度、抗病等性状相关的分子标记或主效基因，为中国对虾的遗传图谱构建、 qtl作图、分子标记辅助选择及其他育种方法奠定遗传学基础，同时对中国对虾性别相关标记和sampl法发展微卫星标记作了一些探讨。