第二届亚洲水产学术会议(1989.4.17～22)在日本东京召开

来自许多国家共约450名代表参加了这次盛会。出席人数以日本为最多,195名。我国47名(大陆10人)。菲律宾44名。来自亚洲国家和地区的还有印度、印尼、泰国、马来西业、新加坡、斯里兰卡、香港、科威特、孟加拉和尼泊尔的代表们;国际方面有加拿大、美国、澳大利亚、英国、法国、挪威,瑞典、希腊、巴西和苏丹等等15个国家的40名代表与会。其中有亚洲水产学会理事长蔡程瑛博士、国际发展研究中心新加坡办事处主任戴维博士、日本水产学会理事长须山三千三博士、东京大学农学部研究生院院长羽生功博土、东京水产大学校长野村稔博士、下关水产大学校长青山恒雄博士和本届组委会主席(上届日本     

A new map of the tiger shark (Galeocerdo cuvier) genetic population structure in the western Atlantic Ocean: Hypothesis of an equatorial convergence centre

1. The tiger shark (Galeocerdo cuvier) is a common widespread coastal–pelagic shark species whose population genetic structure has only recently been the object of genetic studies.
2. In this study, the tiger's shark mitochondrial DNA control region was sequenced for a sample of 172 individuals from the western Atlantic and from Australia's east coast in the Pacific Ocean.
3. The results show a moderate variation in genetic diversity (h = 0.615 ± 0.038, π = 0.00184 ± 0.00021) with a strong population structure between Atlantic areas (Φ_ST = 0.28141, P = 0.00001).
4. The maternal lineage has high site fidelity, which paradoxically is coupled with connectivity across open ocean stretches to Fernando de Noronha Archipelago, which is identified as an important hotspot for this species. These results help with the understanding of what drives the displacement of this shark, at intra‐ and/or inter‐ocean basins levels, and can help inform the implementation of future conservation and management measures.
5. We recommend that the conservation of genetic diversity should be maintained at a global level and its maintenance should be pursued diligently in all populations of tiger shark. As the Fernando de Noronha region in the western Atlantic appears to contain the largest global genetic diversity of the species, this area should be treated as a marine reserve or ecological refuge for the tiger shark.