岷江下游产漂流性卵鱼类早期资源现状

The Larval Esources of Fishes Spawning Drifting Eggs in the Lower Reaches of the Minjiang River

为了解岷江下游干流江段产漂流性鱼类早期资源状况,于2016和2017年的5月7日～7月30日在岷江下游干流江段进行鱼类早期资源调查。调查发现:产漂流性卵鱼类18种,其中长江上游特有鱼类8种,分别是小眼薄鳅(Leptobotia microphthalrna)、长薄鳅(Leptobotia elongate)、红唇薄鳅(Leptobotia rubrilaris)、异鳔鳅鮀(Xenophysogobio boulengeri)、裸体异鳔鳅鮀(Xenophysogobio nudicorpa)、四川华鳊(Sinibrama taeniatus)、中华金沙鳅(Jinshaia sinensis)和短身金沙鳅(Jinshaia abbreviata)。主要产卵场有喜捷镇、高场镇和蕨溪镇3处。小眼薄鳅和长薄鳅的产卵规模相对较大,分别为652.75×10~6粒或尾和368.01×10~6粒或尾。典型对应分析结果显示,鲢(Hypophthalmichthys molitrix)和草鱼(Ctenopharyngodon idellus)产卵时断面流量相对增大,透明度相对降低;吻鮈(Rhinogobio typus)产卵期间江水透明度相对较高;随着流速增加,中华金沙鳅(Jinshaia sinensis)和短身金沙鳅(Jinshaia.abbreviata)卵漂流密度均相应增加。

In order to study the larval resources conditions of fishes spawning drifting eggs in the lower reaches of the Minjiang River, the surveys of fish resources of early life stages were carried out in the lower reaches of the Minjiang River during May 7-July 30, 2016-2017. The results showed that there were 18 species of fish with drifting eggs, among which 8 species were endemic species in the lower reaches of the Minjiang River. They were Leptobotia microphthalrna, Leptobotia elongate, Leptobotia rubrilaris, Xenophysogobio boulengeri, Xenophysogobio nudicorpa, Sinibrama taeniatus, Jinshaia sinensis and Jinshaia abbreviata. Three important spawning grounds of fish with drifting eggs mainly located in the towns of Xijie, Gaochang and Juexi. The largest spawning scale of fish were Leptobotia microphthalrna and Leptobotia elongate, with the egg quantit w 652.75×10~6 ind. and 368.01×10~6 ind., respectively. The result of Canonical correspondence analysis showed that the increase of the flow stimulated the spawning of Hypophthalmichthys molitrix and Ctenopharyngodon idellus, as well as decreased the transparency and increased the density. High transparency stimulated the spawning of Rhinogobio typus. As the velocity increased, the drift densit of both the Jinshaia sinensis’s and Jinshaia abbreviata’s eggs higher.