Abstract
Acipenser dabryanus is an endemic fish inhabiting the upper reaches of the Yangtze River in China. It is classified as a first-class nationally protected animal in China and is listed in the International Union for Conservation of Nature (IUCN) Red List of Critically Endangered Species (CR). Recently, there has been a decrease in natural reproduction of A. dabryanus, and the wild population is almost extinct. This paper summarizes the changes observed in the natural population of A.dabryanus and the factors leading to its endangerment. Based on the process of artificial propagation and achievement of relevant protection goals, this paper presents the concept and technical framework for reconstruction of the wild population of A. dabryanus. In addition, by comprehensively reviewing the research findings and existing problems in the resource protection and monitoring of A. dabryanus in recent years, we assessed the possibility of wild population reconstruction and resource restoration for A. dabryanus. Reconstruction and restoration measures for the wild population of A. dabryanus are proposed, with the aim of providing a scientific basis for the reconstruction of the natural population and the improvement and restoration of critical habitat of this species. Furthermore, it is hoped that this paper will serve as a reference for the protection and restoration of other endangered fishes.
Highlights
A. dabryanus feeds on animals, such as aquatic insects and benthic invertebrates, whereas adult fish mainly consume plants, such as stems, leaves, fragments of vascular plants, and algae [3]
Prior to the construction of the Gezhouba Dam, A. dabryanus was widely distributed in the mainstream, tributaries, and river-connected lakes in the middle and upper reaches of the Yangtze River
A total of 39 A. dabryanus were unintentionally caught in the Yibin section of the upper reaches of the Yangtze River
Summary
Known as Dabry’s sturgeon and Yangtze sturgeon, belongs to the class Actinopterygii, family Acipenseridae [1]. Male individuals sexually mature at 4 years old, while female individuals reach sexual maturity at 6 years old. A. dabryanus reaches body lengths of up to 130 cm and may weigh > 16 kg [2]. In terms of food habits, A. dabryanus is considered omnivorous; the food types of juvenile and adult fish are different. A. dabryanus feeds on animals, such as aquatic insects and benthic invertebrates, whereas adult fish mainly consume plants, such as stems, leaves, fragments of vascular plants, and algae [3]. Benthic small fish are a preferred food source for A. dabryanus [4]
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