Effect of Stocking Density on the Growth of the Endangered Amazonian Fish Hypancistrus zebra (Siluriformes: Loricariidae)

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Fábio José Torres de Barros, Isadora Ribeiro da Silva Lobato Bahia, Thaís Pereira Nascimento, Mayllon C. de S. Moura, Rayane A. Torres, Tatiana da Silva Pereira, Leandro Melo de Sousa
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引用次数: 0

Abstract

Stocking density has a significant influence on animal homeostasis, and so is a crucial factor in the management of organisms in captivity and an important role in ex situ conservation of endangered species. Hypancistrus zebra is an endemic fish species from the Xingu River, Brazil—considered Critically Endangered since the early 2000s due to fishing pressure and, more recently, due to habitat changes resulting from the construction of the Belo Monte Hydroelectric Dam. The implementation of appropriate management in captivity is of utmost importance for its conservation, particularly in enhancing ex situ breeding techniques. This study aimed to evaluate the growth of juvenile H. zebra in aquaria with three different stocking density levels. The juveniles were distributed between three treatments, each with three replicates. We found no correlation between biomass and aquarium volume. The highest correlation coefficients were found between growth rates and densities related to the number of individuals per shelter area. Mortality rate was directly related to the initial number of fish in the aquariums, with larger populations showing higher mortality rates. The treatment with lower stocking density displayed the highest growth rate, while the treatment with higher density had the lowest growth rate, with a 23.38% difference between them.

放养密度对亚马逊濒危鱼类斑马鱼(绢鱼科:Loricariidae)生长的影响
放养密度对动物体内平衡有重大影响,因此是人工饲养生物管理的关键因素,也是濒危物种异地保护的重要角色。斑马鱼(Hypancistrus zebra)是巴西新古河(Xingu River)的一种特有鱼类,由于捕捞压力以及最近贝洛蒙特水电大坝(Belo Monte Hydroelectric Dam)建设导致的栖息地变化,自 2000 年代初以来一直被视为极度濒危物种。实施适当的人工饲养管理对其保护至关重要,尤其是在提高异地繁殖技术方面。本研究旨在评估三种不同放养密度的水族箱中斑马鱼幼鱼的生长情况。幼体被分配到三个处理中,每个处理有三个重复。我们发现生物量与水族箱容积之间没有相关性。生长率与密度之间的相关系数最高,密度与每个遮蔽区的个体数量有关。死亡率与水族箱中的初始鱼群数量直接相关,鱼群数量越大,死亡率越高。放养密度较低的处理显示出最高的生长率,而放养密度较高的处理生长率最低,两者相差 23.38%。
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来源期刊
Aquatic Conservation-Marine and Freshwater Ecosystems
Aquatic Conservation-Marine and Freshwater Ecosystems 环境科学-海洋与淡水生物学
CiteScore
5.50
自引率
4.20%
发文量
143
审稿时长
18-36 weeks
期刊介绍: Aquatic Conservation: Marine and Freshwater Ecosystems is an international journal dedicated to publishing original papers that relate specifically to freshwater, brackish or marine habitats and encouraging work that spans these ecosystems. This journal provides a forum in which all aspects of the conservation of aquatic biological resources can be presented and discussed, enabling greater cooperation and efficiency in solving problems in aquatic resource conservation.
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