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The survival and respiration response of two abalones under short-term hypoxia challenges
Aquaculture ( IF 4.5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.aquaculture.2020.735658
Yawei Shen , Miaoqin Huang , Weiwei You , Xuan Luo , Caihuan Ke

Abstract Anthropogenically increased occurrence of hypoxic conditions in the aquatic environment, combined with climate change-induced temperature increase, is causing increased concern for aquaculture species. In this study, the survival of the Pacific abalone Haliotis discus hannai (DD) and its hybrid offspring (H. discus hannai ♀ × H. fulgens ♂, DF) were observed under 96 h hypoxia at both optimum temperature (20 °C) and high temperature (28 °C). The respiration rates (MO2) of DD and DF facing acute hypoxia at three temperatures (20 °C, 25 °C, and 28 °C) and progressive hypoxia at three different sizes (2 cm, 4 cm, and 6 cm) were compared. At 20 °C, there was no significant (p > .05) difference between median lethal concentrations (LC50) of DD and DF while considering all time intervals; however, at 28 °C, 96 h DO LC50 of DF (3.18 mg/L) was lower than that of DD (4.82 mg/L), indicating that DF displayed stronger hypoxia tolerance ability than DD at 28 °C. MO2 of DD and DF increased with rising temperature and larger sizes under acute and progressive hypoxia tests, while DF showed higher MO2 than DD, indicating its better plasticity of oxygen uptake. These results suggest that DD might be more vulnerable to a combination of thermal and hypoxia stress than DF, revealing that hybridization could be a useful way to improve stress-resistance for the abalone aquaculture industry.

中文翻译:

短期缺氧条件下两种鲍鱼的存活和呼吸反应

摘要 人为导致水生环境中缺氧条件的发生增加,加上气候变化引起的温度升高,正在引起对水产养殖物种的日益关注。本研究在最适温度(20°C)和缺氧 96 h 条件下观察了太平洋鲍鱼 Haliotis discus hannai(DD)及其杂交后代(H. discus hannai ♀ × H. fulgens ♂, DF)的存活情况。高温 (28 °C)。比较了 DD 和 DF 在三种温度(20°C、25°C 和 28°C)下面临急性缺氧和在三种不同尺寸(2 cm、4 cm 和 6 cm)下进行性缺氧的呼吸率(MO2) . 在 20 °C 时,考虑到所有时间间隔,DD 和 DF 的半数致死浓度 (LC50) 之间没有显着差异 (p > .05);然而,在 28 °C 下,DF (3. 18 mg/L)低于DD (4.82 mg/L),说明DF在28℃下表现出比DD更强的耐缺氧能力。DD和DF的MO2在急性和渐进性缺氧试验中随着温度的升高和更大的尺寸而增加,而DF的MO2高于DD,表明其吸氧可塑性更好。这些结果表明,DD 可能比 DF 更容易受到热和缺氧胁迫的影响,表明杂交可能是提高鲍鱼养殖业抗逆性的有用方法。表明其吸氧可塑性较好。这些结果表明,DD 可能比 DF 更容易受到热和缺氧胁迫的影响,表明杂交可能是提高鲍鱼养殖业抗逆性的有用方法。表明其吸氧可塑性较好。这些结果表明,DD 可能比 DF 更容易受到热和缺氧胁迫的影响,表明杂交可能是提高鲍鱼养殖业抗逆性的有用方法。
更新日期:2020-12-01
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