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Environmental influences on the juvenile migration of the threatened amphidromous Australian grayling (Prototroctes maraena)
Marine and Freshwater Research ( IF 1.8 ) Pub Date : 2020-01-01 , DOI: 10.1071/mf20039
W. M. Koster , F. Amtstaetter , D. Dawson , R. A. Coleman , R. Hale

Many diadromous species are threatened globally. Management actions to conserve these species need to be based on a quantitative understanding of their life history requirements. The transition between marine and freshwater habitats is a critical component of the life cycle of diadromous fishes, but is poorly understood for many species. We investigated recruitment patterns of juvenile Australian grayling (Prototroctes maraena), a nationally threatened amphidromous fish, entering freshwater environments in four streams in south-east Australia across 3years (2016–18). Migration occurred from September to December, with peak abundances between late October and early November (mid-austral spring). Catches were also related to mean daily discharge in the preceding 7days, with highest catches at intermediate flows (~100–150MLday–1). Our results can inform management actions, such as environmental flows, for attracting and facilitating the movement of juvenile Australian grayling into freshwater from marine nursery areas.

中文翻译:

环境对受威胁的两栖澳大利亚鳟鱼(Prototroctes maraena)幼鱼迁徙的影响

许多diadromous物种在全球范围内受到威胁。保护这些物种的管理行动需要基于对其生活史要求的定量理解。海洋和淡水栖息地之间的过渡是洄游鱼类生命周期的重要组成部分,但对许多物种知之甚少。我们调查了澳大利亚东南部四条溪流中 3 年(2016-18 年)的全国受威胁两栖鱼类幼年澳大利亚鳟鱼 (Prototroctes maraena) 的招募模式。迁徙发生在 9 月至 12 月,在 10 月下旬至 11 月上旬(中南春季)之间达到峰值。产量也与前 7 天的平均日排放量有关,中间流量(~100-150MLday-1)的产量最高。
更新日期:2020-01-01
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