Huangshan population of Chinese Zacco platypus （Teleostei, Cyprinidae） harbors diverse matrilines and high genetic diversity

Six main mitochondrial DNA （mtDNA） lineages have been described in minnow （Zacco platypus） samples obtained from northern, western and southern China Perdices et al. （2004） predicted that further sampling of other tributaries might discover more lineages of this species. In this study, we collected 26 Zacco platypus individuals in the Huangshan area of eastern China and determined the cytochrome b （cytb） sequence variations. Combined with reported data in GenBank, we identified ten matrilines （Zacco A-J） in a total of 169 samples, with relatively high molecular divergence found among them. The Huangshan population had the greatest genetic variation among all sampled regions and hosted six of the ten matrilines. Our results highlight the significance of the Huangshan area for the conservation of Zacco platypus.

汉江上游支流堵河宽鳍鱲的年龄与生长特征研究

2018年6月-2019年5月开展湖北堵河水系宽鳍鱲(Zacco platypus)种群资源调查,首次描述了堵河宽鳍鱲的年龄结构和生长特性,并与其他水域进行对比分析。结果显示:堵河水系宽鳍鱲由3个年龄组组成,其中2龄为优势年龄组,占比55.2%。体长(L)、体重(W)分布区间分别为6.4~20.3 cm、4.0~106.8 g,优势体长、体重范围分别为8.2~15.4 cm、14.4~45.7 g,占种群的87.1%和70.3%。雌雄群体和种群的W-L方程分别为W♀=0.0285L^2.7466、W♂=0.0526L^2.5445和W=0.0306L^2.7421,Von Bertalanffy拟合的体长和体重生长、生长速度以及加速度的拟合方程分别为:雌性:Lt♀=18.31×[1-e^-0.3973(t+0.6843)]、Wt♀=81.62×[1-e^-0.3973(t+0.6843)]2.7466、dL♀/dt=7.2746e^-0.3973(t+0.6843)、d^2L♀/dt^2=-2.8902e^-0.3973(t+0.6843);雄性:Lt♂=17.85×[1-e-0.3875(t+0.7448)]、Wt♂=61.47×[1-e-0.3875(t+0.7448)]2.5445、dL♂/dt=6.9169e-0.3875(t+0.7448)、d^2L♂/dt^2=-2.6803e^-0.3875(t+0.7448),雌雄群体的极限体长、体重分别为183.1 mm/81.62 g和178.5 mm/61.47 g,拐点年龄分别为1.86龄和1.67龄,拐点体长和体重分别为135.5 mm/25.2 g、108.3 mm/17.3 g。与其他水域相比,堵河宽鳍鱲年龄结构比较简单,但其具有更大极限体长、体重和更低的拐点年龄,而且生长速度更快,是发展山区特色淡水鱼产业的优良品种。