National Science Library, Chinese Academy of Sciences
  登录 机构网站 ENGLISH

期刊名称: Aquaculture Research
Volume:42    Issue:6        Page:835-843

Characterization of whitebait (Galaxias maculatus) respiratory rates to optimize intensive culture carrying capacities期刊论文

作者: Encina‐Montoya Francisco Vega‐Aguayo Rolando Mardones‐Lazcano Alfonso Rueda Teresa Tello Alfredo

页码: 835-843
被引频次: 5
出版者: Blackwell Publishing Ltd,WILEY-BLACKWELL,Wiley Subscription Services, Inc
期刊名称: Aquaculture Research
ISSN: 1355-557X
卷期: Volume:42    Issue:6
语言: English
摘要: Galaxias maculatus is an osmeriform native fish of the Southern Hemisphere, in which the crystalline larvae is considered as a luxury delicacy, for this reason, it has been commercially exploited in Chile, Argentina and New Zealand. However, the fisheries have been rapidly decreasing due to the overexploitation and the predation of introduced species. Because of these events, there is a need to determine a carrying capacity for an intensive fish culture. In order to optimize stocking densities for fish culture, this paper proposes objectives to determine oxygen consumption (OC) rates, dissolved oxygen concentrations that produce signs of hypoxia and the average time elapsed between food intake and peak OC in G. maculatus. In the oxygen experiments under routine metabolism conditions, we found that G. maculatus adults and whitebait showed signs of asphyxia at dissolved oxygen concentrations between 1.3 and 2.2 mg L−1 and that adults tolerated dissolved oxygen levels as low as 1.3 mg L−1. The results showed that G. maculatus individuals with an average weight of 0.04 g consumed 0.048 mg O2 h−1, whereas individuals with an average weight of 1.4 g consumed 0.345 mg O2 h−1. Galaxias maculatus increased the OC rate by 31%, from 0.39 to 0.51 mg O2 h−1 g−1, occurring 14 min after food intake. The carrying capacities for industrial cultures of G. maculatus, were estimated using an allometric equation (OC=0.2363 ×W0.612), a water flow rate of 1 m3 h−1 and an input oxygen concentration of 10 mg L−1 at 12 °C. The density culture of whitebait (4 g) can be allowed to reach 8–11 kg m−3; therefore, these stocking densities reduce the risk of hypoxia and mortality, ensuring the appropriate growth and feed conversion rates.
相关主题: carrying capacities, respiration, Galaxias maculatus, whitebait, oxygen tolerance, Oxygen tolerance, Whitebait, Respiration, Carrying capacities, HYPOXIA, FRESH-WATER FISH, SPECIAL EMPHASIS, RESPONSES, FISHERIES, TEMPERATURE, METABOLISM, GROWTH, STANDARD OXYGEN CONSUMPTION, DISSOLVED-OXYGEN, WEIGHT,






在线获取原文 原文传递 详细信息 图书在架状态 图书馆际互借 问图书馆员


图书馆开放时间 图书馆位置 借阅要求 您在使用中发现的任何错误,都可以向我们 【报告错误】,非常感谢!