The genetic structure of selected five finfish populations, namely, almaco jack (Seriola rivoliana), sailfin grouper (Mycteroperca olfax), stalkeye scorpionfish (Pontinus strigatus), wahoo (Acanthocybium solandri) and yellowfin tuna (Thunnus albacares) in the Galapagos Islands, was studied using mitochondrial DNA cytochrome b (797 bp) and D-loop (426 bp). The results of the present study showed that (1) almaco jack, yellowfin tuna and wahoo had high haplotype diversities and numerous singleton haplotypes and spread over extensive ranges, as expected in pelagic fishes, while only Galapagos yellowfin tuna from D-loop dataset showed population expansion (P < 0.05); (2) sailfin grouper cyt b had low haplotype and nucleotide diversities, confirming the concern from previous study that the fish was overfished in waters off the Galapagos Islands. It further supports the need to effectively manage sailfin grouper; (3) Stalkeye scorpionfish cyt b had also low haplotype and nucleotide diversities, but with significant negative Fu’s F_s, (P < 0.01), indicating genetic hitchhiking and overall reduction of genetic variation, supporting the need to monitor stalkeye scorpionfish; and (4) no genetic differentiation was found between Galapagos and Western Pacific yellowfin tuna (P = 0.9). The singleton haplotypes specific to the Galapagos yellowfin tuna population might indicate reproductive isolated units or founders. The results provide an insight into the genetic structure of finfish populations, which can be used to draw an effective management plan for ensuring their long-term sustainability in the Galapagos Islands.

选定的五个有鳍鱼类种群的遗传结构，分别是阿尔玛科杰克（Seriola rivoliana），赛鳍石斑鱼（Mycteroperca olfax），茎杆蝎鱼（Pontinus strigatus），瓦霍（Acanthocybium solandri）和黄鳍金枪鱼（Thunnus Galabasago），使用线粒体DNA细胞色素b（797 bp）和D环（426 bp）进行了研究。本研究的结果表明（1）如远洋鱼类所预期的那样，（1）阿尔马科杰克，黄鳍金枪鱼和具有较高的单倍型多样性和众多单身单倍型，并分布在广泛的范围内，而仅D-loop数据集的加拉帕戈斯黄鳍金枪鱼显示种群膨胀（P<0.05）; （2）Sailfin石斑鱼cyt b单倍型和核苷酸多样性低，证实了先前研究的担忧，即该鱼在加拉帕戈斯群岛附近的水域中被过度捕捞。它还支持有效管理风帆石斑鱼的需要；（3）茎杆鲈的cyt b也具有较低的单倍型和核苷酸多样性，但Fu's F _s显着为负（P <0.01），表明遗传搭便车和遗传变异总体减少，支持对茎杆鲈的监测。（4）在加拉帕戈斯群岛和西太平洋黄鳍金枪鱼之间未发现遗传分化（P= 0.9）。加拉帕戈斯黄鳍金枪鱼种群特有的单身单倍型可能表明生殖孤立单位或建立者。结果为有鳍鱼类的遗传结构提供了见识，可用于制定有效的管理计划，以确保有鳍鱼类在加拉帕戈斯群岛的长期可持续性。